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You learn percussion? I am a percussion player. If it is symmetrical, my thumb and forefinger are clenched and the other fingers are relaxed. If my left and right hands are not in the same posture, my thumb is clenched and my middle finger (ring finger, wrong in front) is pressed.

Supplement: The left hand needs to be held by thumb and ring finger, but it needs wrist force.

Fingers should be strong and wrists should be hard. Finger hard, because you have to hold the stick tightly, but you still have to knock it with your wrist. Speed is a matter of proficiency and can be controlled by yourself.