So I am starting to think my last crash may have had something to do with the boom twisting mid flight. Although I have had them twist in the past and not cause a crash the copter definitely doesn't react or fly as smoothly when they are twisted. I have metal boom clamps and they are as tight as they can possibly get without stripping or snapping the bolt. I even lightly scuffed/sanded where they mount. The only other thing I can think of at this point is to drill a small hole and use a set screw to keep the booms from rotating. I do this on the tail boom of all my 3D helis to keep it from rotating...thoughts?