I personally shoot the spitfire 100's, the 125's only have a little spacer behind to add the extra 25gr.

They do not cut on impact, the will punch, but with that and the extra KE our bows have, that is not much of a factor. I have looked at the XP and have wondered if it would plane in flight as well. I honestly do not think that if it did plane, that it would not be effected very much, but since we are talking about the accuracy that we are, it could become noticable, but not managable.

hope this helped and not cnfused you more