There is no "boost", punch is just how much current the ESC dumps into the motor when you punch the throttle. Most esc's have a "soft start" function... which limits the power when you hit the throttle to act like a traction control, "punch" is like the reverse of soft start. Either 100% or 0% will be full "punch", pick the one that works. If you already have it set to full "punch", then you cant get any more power out of your current system.