Hey Slicepong,
That’s a really good question, you want to try and hit the ball slightly thinner as you mentioned whilst keeping the bat angle at pretty much 45 degrees. During the 30 and 60 you can also play with a little less arm speed but not too much because you still need acceleration to play a quality shot, its more the contact that you are using to vary the shots. During the 90 speed one you are playing a more direct shot with a faster arm speed whist trying to maintain the spin and safety. Remember it’s important to focus on the legs and body during this technique and not just the arm to have full control, and the ability to adjust and vary your strokes well.
