Sadie, I had a bow once that was doing the same thing. I had solid deer antler tips on it, about the last 6" of the limb. Anyway, it was due to the shape and depth of the string grooves, soon as I changed the tips to wood, and made deeper grooves it was fine. I don't know if that'll apply to Wayne's bow, but just thought I would share my experience. hope it works out for him.
Tattoo Dave