I was up at that shoot myself, and it was seriously hot out there. hanging bows up in that direct sunlight for more than an hour was asking for trouble. i got spooked and laid all mt bows in the van with the doors wide open, and waited till they cooled down to unstring them.
I'm real sorry to hear about you loosing a limb. i won't use anything but a sellway stringer, or a stringer made by Sixby on my RC's. When you buy a custom bow, or a set of static tip limbs from Sixby, he will send you a stringer made for the limbs upon request.
I'd highly recommend Steve for building some new limbs for you.... Kirk