Im racing small sprint track. Adult heavy class. Lo-206.. Im running in the top two or three every race. I need to pick up 1 second a lap. Im running 35 chain and front gear is 16 rear sprocket is 73. there are a lot of tight corners.. Any suggestions. Im within 3 lbs of the weight limit for the class. Im frustrated I can't seem to get the little bit. What would you guys do.??/