I live in Kitsap County... a town called Silverdale.
Anyway, the problem with the legal system is that you can't really just go in and say, "Your honor, I was going 15MPH over the legal limit, not 20, and I would just like to pay the fine for 15 over, not 20 over." You can't plead guilty for a crime they didn't accuse you of committing! That's the problem. And that's why cops put 5-10MPH over what you were actually doing, because the money goes to the state general fund, and when the legislature decides where the funds go to, they take into consideration where it came from. So the cops say, "we'll bring in an extra 5 million in 'revenue' this quarter and you keep 1 million of it and we'll use the rest."
The system (especially around here) is completely corrupt. The judges get paid from the same fund so they have absolutely NO incentive to be fair, their incentive is to have as many "guilty" findings as they possibly can. The only exception to this, in my experience, is when the judge is is out sick and they have a "pro-tem" judge to fill his/her shoes. In this case, they generally hire a lawyer who doesn't work for the state, and they are generally favor the accused more than the accuser (which is how it's supposed to be - innocent until proven guilty). A major issue here is that they don't have to prove "beyond a resonable doubt" that you committed a crime. Since it's an "infraction" not a criminal offense, they use a completely different standard. They have to prove with a "preponderance of evidence" that you committed the infraction. This is their loophole - since it's not a criminal offense, they can lie to themselves and think that they're doing the public a greater good by bringing money into the system (nevermind the 7 years of higher insurance premiums hard working citizens have to pay with a ticket they didn't deserve on their record). If you look in the dictionary, "preponderance" means "overwhelming," so logically, a preponderance of evidence would mean overwhelming evidence. But the judges decided at some point in time that "preponderance" actually means "the majority" which is something like 50.01% of the evidence has to favor the cop. Now, they consider the cops "sworn statement" to be "evidence" (not testimony, which is crap, because when I write something on the paper and submit it to the court, they don't consider THAT "evidence"). You are screwed from the beginning.
You can't go into court (here in WA at least) and tell the truth about exactly what happened. If you do that ("your honor I was only going 2 mph over the speed limit, not 15, so I should not be convicted of going 15 over") they will convict you of exactly what the officer accused you of. You have no chance.
So your only hope is to get off on a technicality. Luckily, there are literally HUNDREDS of technicalities that you can get off on. Hell, you can question the officer and if answers a question wrong or inaccurately and you can prove it (like if he doesn't know the maximum range of his radar or laser device), he's an incompetent witness and all of his testimony can be thrown out, leaving no evidence against you, and therefore your ticket will be dimissed.
The problem here is having all the information readily available and having the willpower to follow through with it. When you really get down to it and think about it, they could completely irradicate speeders within a MONTH if they really wanted to. If they made the fine for speeding $100 per MPH over, nobody, and I mean nobody (except maybe bill gates) would speed. The problem is that the state, the court system, the cops, and whoever else all get money from the "revenue" generated from speeding tickets. It's in their best interests to have the fines set such that they are earning more money from the tickets than they spend paying the cops to write them. And that's why they leave all these loopholes - they want people to speed. Seriously, COPS WANT PEOPLE TO SPEED SO THEY CAN GET PAID. Hell, around here you get awards for giving out the most speeding tickets. And yes, they all lie on their tickets. They will act like they were doing you a favor for writing that you were doing "50+" in a 45 zone instead of the 65 you were actually doing. This is not them doing you a favor. This is their way of bribing you to just pay the ticket and not fight it.
And that's the reason cops aren't required to show up to speeding ticket trials around here - they make more money by writing 5 more tickets in the amount of time it would take them to go to court and actually face the music (that they don't know crap about their equipment, that they aren't qualified to write tickets, and that they are lying sacks of crud).
So anyway, there are literally tons of sites on the internet that will sell you books trying to help you get out of your ticket. They are generally not worth it. Some offer money-back guarantees. I have never purchased one, but the few that looked decent had the exact same information I am giving you above in their "teaser" pages. You can always go into a book store (or perhaps amazon.com) and leaf through the pages and decide how you want to proceed.
I still think your best bet is to get all the information you can, sift through and make sense of it all, sit through as many trials as you can, and do your best to get it dismissed without ever having to even say "I wasn't speeding." That's the trick: they are accusing you of going 20 over. You weren't going 20 over. Therefore, you are innocent of the crime they are accusing you of committing. You can file at least a dozen motions to dismiss (based on technicalities, inaccurate information, cops not showing up, invalid radar/laser/tuning fork/speedometer certifcations, etc.) before you are even sworn in!
Hell, even if you thought you were going 20MPH over the speed limit, who's to say your speedometer is 100% accurate? It's always in your best interests to plead innocent, get the information they have against you, verify that the cop dotted all his is and crossed all his ts, has valid training, certification for his equipment, etc. If he's got that all taken care of and you agree with his estimation that you were in fact speeding, you can always go in, change your plea, and pay the fine.
The system is stacked against you - you can't even get ahold of that information without first pleading innocent and requesting it. If you plead guilty, they have no obligation to send you anything and as soon as the court gets your paperwork, they will file it on your driving record and you will be screwed.