Im building two kids/youth bows right now. I have a red oak board and bamboo to back it. It alone wouod make one self bow but two if I back it. Looking for 30#@28. Idea being its always a shootable bow as they grow up. So, I want to avoid set, for obvious reasons. Im making them pyramid shape for ease of tiller. Do I trap the back or is red oak strong enough in compression I dont need to?