​​​Very likely not the case.

Straight line speed is based off corner speed. You are getting passed on the straights because they slowed down less for the corner before the straight. Getting through a corner as quickly as possible is a skill you need to improve. You need a well built, well set up car on the right tires to be able to maximize corner speed. A few more degrees of motor timing won't make up for inability to take a corner as fast as possible.

You can cheat, but you lack the driving ability to take advantage of the power gain you would get by changing the timing. Does this class have a gear ratio limit too?