Man I don't know SwampCollie. You sound like you've covered all the possibilities. Maybe you can build 1 or 2 shafts with no cresting, a regular X nock, and try it. But I've never seen cresting, or a lighted nock cause that much of a disturbance in arrow flight........but then again I haven't played with them that much to draw any concrete conclusions.

I didn't want to sound like I think shooting crooked flying arrows at deer in the woods is my thing, because that's just not right. But I did own a hoyt xtec couple years ago that behaved similarly. No matter what I did, I popped a 1.5" tear left tear in paper at 6 to 10 feet. At 25-30 feet, it was a perfect tear...... it did this with any arrow/point combination I threw atit for 2 years. In all honesty, it shot like a demon with broadheads out to 50 yards, and grouped my muzzy's right with my field points. It was the most comfortable I've everbeen with a hunting bow once I got over the paper tear "problem". So I ran with it, and enjoyed taking 10 deer with it in 2 seasons, anywhere from 10 yards out to 55. None went over 100yards.

I'mcurious to know what had happened since you said it shot straight before. My bow did that from the beginning, so it's not really a comparable scenario. I hope you figure out, and I'd like to hear from ya if you do. If I think of anything else, I'll post it.

Later man

Mike