ORIGINAL: nodog
Well if it is an arrow problem that doesn't say much for the guy who sets bows up or the shooter. I'll give ya the benifit of doubt and say it's a mechanical problem maybe a bent axel.
Alot of people out there trying to tune these bows off of the arrow chart specs when they need to go to a stiffer spine. It's a common mistake, I know to check it, you might know to check it, but people are doing it just the same on a daily basis.