Ken, I'm not sure what you mean by my axle to axle changing. I don't see how that's possible other than from a little string stretch. Are you talking about the tiller? Also I have tried a lighter spined arrow (a Gold tip 4575) with the same results. I looked at my cams this evening while my brother in law held it back at full draw. The top cam seems to be leaning to the left at full draw. When let down it seems to be perfectly inline. The bottom cam seems in line no matter what. Could cam lean cause this fishtailing?