For anyone who has used one.

Vaguely toying with adding a man/press for the team in "trailing with two minutes down by" situations - as by coincidence seven of my current players are starting the season at a c- or higher in press iq. I think the ath and def are there to effectively do this, but what press iq would be needed by the end of the season to not have that man/press be a hindrance rather than a help?

Small sample size, but I've done it a few times.  For the FCP, you don't want to even think about running it with less than B's.  But I've found the HCP is fine with much lower IQ's.  I never noticed a spike in fouls called or easy buckets.  When going that route, I usually threw 5 minutes of practice into the press.