i have a piece of black locust that i've been fiddling with for about 2 years that is giving some fits. it is 's' profiled, which isn't a problem, but the string doesn't cross the center line. i have tried extensive heating to get it to move sideways, but it won't shift. any suggestions? for the record, it is in the very early stages of tillering. my goal is a 70 to 80 pound draw.