Since seeing a scientific article or 2 about bass and crayfish and how bass prefer crayfish with reduced claws or a missing claw, I like the idea of fishing flies with either smaller claws or with one larger claw and one smaller. While I understand that claws are a prominent part of crayfish, maybe they should be less prominent on the flies we fish?
Rabbit (or squirrel) strips have been just fine for me, particularly the smaller versions. I generally cut off the fur from the first half or so of the strip. Otherwise, pheasant tail fibers on smaller flies work well as do the feather types above.