RC-Monster Forums - Brushed motor question

I know this is primarily a BL forum and I only have a brushed motor in my Losi mini late-model because it is required to race in the stock class. Anyone have some tips for me to get a little more out of my stock losi motor? I feel I'm getting around the track pretty clean with the car, I don't think I'm having any issues with the setup but I'm getting my butt kicked! The races are 4 minutes and I make the B main with 53-54 laps but the winner in B and A mains are running 58+ laps. Better batteries aren't the case as we are only allowed a stock 1100mah pack or a dynamite 1500mah pack, and I'm running the dynamites. I charge them between 1.5 and 2 amps and then re-peak them just before the race at 3amps. Any tips would be appreciated, otherwise I'm just going to try a new stock motor.