Breaststroke Kick

A while back there was a thread that discussed the use of a board for kicking - is it good or not. I know that in my case when I use a board my shoulders hurt. It seems to put some weird stresses on the shoulder. So here is my question: Is there a good way to do the breaststroke kick without a board. I already flutter kick (on my side) and dolphin kick (5 kicks underwater then a quick scull to the surface to breathe). The only thing that I can think of is to do a 2 kick (or 3 or whatever) vs. 1 pull drill on the breaststroke. Any ideas out there?