I tend to, at least attempt to, "over do it" with the boil & freeze, so that when they rebound that little bit, they go to where I wanted them. nothing drastic, just a little bit, but I've found it works.
I B&F'd all my Rep. Commandoes for instance, as I can't get anyone but Scorch to stand. They look great now though, very well stanced, and don't tip easily. It was one of the most complex B&F's ever though as I had to squeeze the legs and at the same time pose the feet. A real pain. I'd say Cody, and his gummy counterpart, were equally frustrating B&F's.
Cody rebounded some but he looks good yet. I'll maybe snap some photos at some point and see if I can show them off here to see what I did.
I will say I use a stand frequently when B&F'ing so that the feet are flat and just as I want them. Make sure you get 'em really boiled up good though, and you freeze them for a while even if it's sorta painful to your hand. Utilize clamps, rubber bands, and other things well too, and act fast. Best advice I can give.