FWIW I learned as a kid hunting rabbits back east alone without a dog the thing that worked best by far was VERY careful still hunting like you would do for whitetail.No, I'd never catch them sitting but when you stop after a couple sneaky quiet steps it seemed to really unnerve them, and they would flush from their positions....much better than trying to noisily kick them out of the brush.
This. Only if we have brush piles do we stomp and shake the pile to flush em.