My best crawdad catches come from creeks with sandy bottoms.I set the traps just upstream of shallow sandy pools,my go to bait is a couple pieces of raw bacon tied inside the trap.Im not sure what size bluegill you are after,but the round 1” opening in a cylindrical trap is not ideal.
In my opinion,the clover leaf style traps are the way to go,providing your state allows them.Dog food is very good for attracting minnows,bacon for crawdads..IMHO.I personally do not fish with crawdads,I trap them for eating,after trial and error,bacon has put more crawdads im my belly than any other baits I’ve tried.....that is not an opinion,that is a fact....fish on!