When I started out I primarily used my palms, except for the 1-handed chords. But as the game speeds up and gets more stamina draining, it's much more advantageous to use your fingers; what comes to mind is Hong-Kong Euro EX, with the large amount of right hand action. Wrist rotation also is a very key factor for things like 1-handed rolls (I've noticed several japanese videos where the hand just goes back and forth, which is very energy draining) and jackhammers (I could explain this one if you want if you didn't catch it before).
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