I generally catch larger bluegill on jigs than I do on live bait. Live bait will catch them all, but mostly only the bigger ones will get the jig hook in their mouth on the initial strike. The smaller ones will grab the tail or the head, but don't usually get the hook.

I did switch from 4lb line to 2lb line when I started fishing jigs more since the 1/64 oz. sizes are generally more productive.