You should always try to fight a traffic ticket, however, going over the speed limit to pass another car is not a defense. Hire an attorney to try to get you out of it other ways, pay the ticket, or go to court.
You should hire an attorney to fight your traffic ticket. An experienced attorney can cross examine the officer about the circumstances of your case. Also if you qualify for traffic school, even if you lose at the bench trial, you can still ask for traffic school. The best case scenario would be setting your case for trial and the CHP not showing up - then you win.
You can contest the ticket. If the officer does not show up at the trial date the ticket will be dismissed so you have nothing to lose by contesting the ticket. The fact that you were going the same speed as others on the freeway is not a defense. 80 mph in a 65 mph zone puts you in the lowest fine bracket, so it is really whether you can get the case dismissed, or possibly a reduction to a coasting violation to avoid the point.--this one is very fact specific though and depends on which court your case is in, the officer and judge hearing the case.
Either fight it yourself or hire an attorney to represent you and handle the hearings for you. This will save you about 3 to 4 hours of your time and the attorney knows the court and what can be done on the ticket.
You always have a chance to fight a ticket. The fact that you were in a cluster of cars is helpful to your defense. Switching lanes and reducing speed is not an appropriate defense. You appear to have a clean record so I would suggest fighting the ticket. I agree with my colleagues, hire counsel. An experienced attorney will boost your chances of success.
Stop posting admissions of guilt on public forums such as avvo.com and fight it either way, whether you do it on your own (not advisable) or with the assistance of a quality, locally experienced, defense attorney (advisable).