first method of success is finding a spot with lots of rabbit sign, but you got that.
hunt at dawn or dusk for best results.
some guys carry a fox40 whistle in their mouth, if one takes off in a dead run, blast the whistle, and most of the time they will stop for a second allowing you too shoot.
check under low evergreens, pines, and in heavy thickets, sometimes youcan almost step on them before seeing them.
when walking down trails or along field edges, go slowly, take your time scaning and sometimes youll see them moving.
if you miss a shot, follow in his direction taking your time and really scanning the area, they dont usually go far.