Some color Springs are stronger than others. Find out which ones are the strongest, or at least stronger, and try them. This will let the engine reach a higher RPM where the it is putting out more torque.
This is one of the main reasons people have tachometers. Not the only reason, but a big reason. If the clutch is set to hold the engine at the rpm where it reaches peak torque, that means there's maximum horsepower at the rear wheels.
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.(Al Nunley)