Ok, so I went out and shot some 100gr FP, and although my shots weren't as wild as with the broadheads, they certainly weren't grouping well. Now, question is...since it seems (from the responses here) that I have to weak of a spine for the broadhead, would it be better to get some 75gr broadheads, or re-site the bow with the 100gr FP, and see how the 100gr broadheads do after that? Thanks again for everyone's responses.