Just theorizing but possibly did the 80 grain TTSX shed its petal immediately on entrance? I have had good results with the Barnes but never drove them past about 3500 fps.
I like the term deflowered for this phenomena. I will give the 87 Hornaday a try when ever I get through all my other bullet testing.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli