Agreed. I have never had any bullet I've shot at a deer not kill it. And premium bullets usually not needed, JSPs do very well.
As for faster kills than the TSX, hard to say. I really don't notice one to kill faster than the other. They both work well.
What I do like of the TSXs though, is I can use lighter weight, increasing velocity/drop, and still kill them just as reliably if not better than a heavier bullet of "lesser" construction. And they seem to do very little pelt damage, if it matters.
I kinda like the tougher bullet in the smaller calibers. Is it always needed? Probably not. Is it better than a 55gr softpoint for imperfect shot angles? Absolutely, IMO. I have a bunch of Winny 64gr PowerPoints that I will not hesitate to shoot at deer, if my TSX supply ever gets low.....