Washington County Oregon Traffic Trial Question?

I got a speeding ticket for going 63 in a 40. I please Not Guilty and requested a Trial. I know that I was speeding, but not by that much. Should I change my plea to guilty and just pay the fines or should I go to court and try and get some leniency? I drive for a living and this has the potential to mess up my employment situation. Would this do anything in the court room? Would they add Court Charges to my ticket? Please give me some insight.