Not intending to get personal, really I think we agree, but at the end of the day MOST hot pintos do not match zetecs. I say most, cause I have not seen many more punching above the figures you and I have experience with. Sure they are out there but they are in the vast minority. As evidenced by the brag board.
At the end of the day unless you have some Idea on how healthy your pinto is the zetec may or may not disapoint. Something old mate never makes clear in the Original link.
It all comes down to dollars and experience as to whether it's worth it.