I have a fire killed white oak that I cut at my hunting spot. My question is this. Is the fact that the bow has been heat treated by the fire on the back going to be a problem? I will scrape below all the char marks. I have read many times that heat treating the back will break the bow. But I have also read natives liked to use fire killed trees. So, whats the best way to do this? The bark on this tree was completely charred, and off in some spots. Its a 4 inch diameter sapling.