I think what actually happened is, you just plain missed, you screwed up.I have shot dozens of shots with numerous different b-heads and they have all shot flawlessly. In fact, we even strung some mesh over the paper tuning frame to specifically test as meny heads as we could and the ONLY b-heads that wouldn't fly well are certain mechs with L-tip shaped blades. I love the fact that I've read a few posts where folks screwed up a shot and naturally they wanted to blame something so the mesh seemed an easy excuse. LOL! I highly doubt it?