pimple sponge thickness

what is the best thickness of the sponge for a pimple rubber? i am beginner defensive player who always chop the ball at my backhand, but the ball always drop or float high so i lose many points,, what can can be the problem?

. sponge thickness

. wrong strokes

. or using a long pimple rubber while still i am beginer defensive player

Hi Ricardo,

It is probably a technique problem.  You should probably start with a 1.5mm sponge under the rubber to give you a bit more control.

Work especially on your defensive stroke.  It will improve with some practice.