I hunted last year with stiff doug firs heavily weighted to loosen them up to fly true out of my 47# bow. I didn't shoot anything but a turkey last year so not much experience on the business end of things. Arrows were about 680 grains so about the same gpp.
A couple of observations on my setup:
1. they drop like rocks past about 18 yards. At 20, they're already falling a few inches. By 21-22 yards, I better not take a shot -- too much room for error.
2. they come out so slow that, when viewed with a slow-motion camera (iphone), they appear to bend into paradox and then flex back toward the bow before the arrow has even cleared the riser. I've wondered about tuning -- whether I may sometimes slide the bow into the arrow if my arm isn't pushing straight toward the target.
I'll add that I've heard plenty of folks talking about penetration being a problem on turkeys. After making a solid shot on that bird last year, the arrow was sticking out the other side with only the fletching still buried inside. The head had been shot already that day, buried in the dirt, recovered & then shot again without resharpening.
This year, I'm rethinking the entire setup in favor of something in the realm of 10-11 gpp. Before making that final shot on the turkey last year, I missed 5 others -- most of those were low & due to bad distance estimation around that 20-yard mark. Sitting low in tall grass on weird angles messes with my head. I can use a little more forgiveness.