juniper responds well to heat treating. the sinew continues to increase the reflex to some degree. my hunting bow is a holmgard style, i reflexed the tips some and have shot it hundreds of times, still has the same shape if not a little more reflex. put 2 heavy layers of sinew on it with rattlesnake skin. most of the serviceberry I have is around 2" diameter. there are some larger but hard to find without lots of branches when they get that big. sounds like my kind of store you are going to. good luck with your projects. keep in mind the bow-building gathering in may north of sisters. wouild love to have you join the rest of us infected by the bug.