Sorry I cant help with the heat bending part, but I've made a lot of bows from fully quartersawn dense hard maple and I can tell you it's a very strong wood, and will make a very fast bow. If you back the maple it's just about indestructable. The compression strength is not to be believed.
The last few bows I've made were walnut backed hard maple and were in the 70/75# range at 28" and they are really sweet shooters. Some of the maple from around here is about 1/32 growth rings and hard enough to "ring" if ya hang in up and hit it. Also it's the main choice of wood for bowling pins......well ya can tell I like it. It's pretty tolerent of design choices also. So I got to believe your in for some very nice bows.