RE: 125 gr vs. 100 gr broadheads on carbons
Switching to 100's will definitely raise your FOC, but you can accomplish the same effect by keeping the 125's and switching to feathers. I went to feathers last year and will never go back to vanes, but that is another debate. hehe. Also, spine shouldn't be an issue with the 125's unless you're pulling some mega poundage. I shoot nitro stingers w/ 4 inch feathers and 125 gr. Snuffers. They fly just like my field points.