I personally switched from a light carbon arrow (cx300)to a heavy carbon arrow (terminator hunter 6075) and I like the heavy one better. My bow is quieter, my groups are more consistent especially with broadheads. I was concerned with arrow drop at 30 yards but I couldn't notice any real difference. I'm now shooting cx terminator hunters w/ 125 gr heads out of a 70#/30" draw Hoyt. I only shoot under 30 yards so I don't need a super fast arrow. I'm a hunter period. If I hit a shoulder blade with my heavy setup I'll be glad I have the heavier arrow. If I was into 3d and long shots I'd definitely go with the lighter arrow.

Download the pinwheel software and model different arrows from your setup. It's real infomative. www.pinwheelsoftware.com