Originally Posted by
cartman308
I'm not tuning pro, but i believe you problem is in the next quote. I'll explain after.
If you went up in head weight your weakening the spine of your arrow. If you boarderline light on the spine and go up in head weight you'll have flight issues due to a weak spined arrow.
PS...... I'm no Rage fan, by any stretch of the imagination.
You are absolutely correct. That is one of the first thing I looked at. The specifications and calculations showed I would be fine up to about a 135 grain head. But at that point the FOC would be way out of wack.