Relax. Don’t use any more muscles than necessary. Maintain a strong fulcrum. When you are not playing, your hands should be at rest in the set position in order to look confident and professional.
Practice playing in front of a mirror to observe your movements. Try filming yourself if mirrors aren’t accessible to you.
Make sure that you can play the whole part with proper mallet heights before attempting to split it up with the bassline.
Understand where the downbeats are present and be able to count all of the rhythms while marking time with your feet. When playing splits, always stay with the full ensemble, don’t adjust your timing to a previous error within the bassline.
