RE: Broadhead Dillemma
TN,
I had another paragraph written, but I went back and looked at your signature. Based on personal experience, I can tell you that your GT 5575's don't have a stiff enough spine for a 125 grain broadhead.
I started shooting GT 5575's with a 100 grain tip at 70#, 29.5" draw. At 70#, the 5575's were borderline underspined even with a 100 grain tip. I figured this out when I tried shooting fixed blade broadheads for the first time. The arrow flexed too much and made it impossible for me to get close to a decent group.
I switched from 100 grains to 125 grains and switched from GT 5575's (.400 spine) to 7595's in Hardwoods HD (.300 spine). I went from a 400 grain total weight arrow to what is now a 500 grain total weight arrow. I did lose around 30 fps, but gained a little kinetic energy. Even after upping my total weight 100 grains, I didn't have to make any sight adjustments at 20 yards or less. 30 yards required a slight adjustment, and 40 yards and out needed a little more. Another big plus..... the extra weight also quiets your bow considerably on the shot.
Since you're shooting 67# and your arrows are more than an inch shorter than mine were, you're spined okay for a 100 grain head, but if you want to shoot 125 grains, you're probably going to need new arrows.