This is not the correct practice area for your question. I'll move your question to a different forum so you may be able to get more qualified answers.
I would say that you are not necessarily required to accept any amount simply because that is what they allege your bike is worth. However, if you think their valuation of your bike is deficient you will need to justify your position and be ready to sue them if the $250 difference is meaningful to you.
Not to sound insensitive but you've summed the status of the criminal "justice" system up pretty well. You are guilty till you prove yourself innocent.
To answer your question if you think you attorney committed malpractice contact a malpractice attorney. If you think the officer violated your civil rights contact a civil rights attorney. You need to speak to an attorney who deals in these matters to see if you have a case.
Driving too close to the white line is not an offense. If that really is what the officer said and truly the reason for the stop - then yes, that is a bogus stop
However by the time the case gets to a 1538.5 motion there will be, in all likelihood, other reasons stated for the stop (i.e. failing to maintain lane, burnt out license plate light, etc.)
Best to see what the officer wrote in the police report.
My opinion is that no news is good news. You should continue to contact the court every week. It is possible that your court has a website that you can check whether your name eventually appears. If 6 months goes by and you don't see a case filed against you one probably won't be.
Or you could walk into the CHP office and remind them about your ticket and ask them to file it against you. The choice is yours.