You can calm it down by using a 2056 pipe. This pipe really smooths out the power and makes it easy to handle on loose surfaces. While still performing great.Also you can run lighter clutch spings and stay away fron aluminum shoes if you are trying to tame it down. .9mm springs and carbon shoes etc... Also adjust your throttle speed or exponential adjustment to slow down the speed the carb opens..you can try venturis but putting in a smaller venturi will help a bit but from how you describe it wont do enough. the other options will be more effective.........