It certainly appears that you did get enough deflection to be a problem, and the short length of the heads may be a factor. I have 3 that I didn't use because I couldn't get them sharp enough to satisfy me. FWIW, I don't aim to hit the " X ring" on a quartering away shot, but try to hit farther back and angle the arrow through the center of the vitals. This year's doe was hit in the last few ribs (slicing through 3 of them) and exited in front of the off side leg. This was with a Muzzy. If I had hit this deer in the place where you would get a good score on a 3D target, I would have only gotten one lung. Just my opinion.

Avoid the inevitable until it is absolutely unavoidable!