Great post until:
my main issue is w/ AA, KK, AK where I want a caller vs. lower PPs where I'd rather just shut it down pre-flop.
Err, what?

You play lower PPs in order to hit sets and get paid. Low-mid PPs play fantastically multi-way, whereas AA,KK, AK you probably prefer to get HU.

Go ahead and adjust your PFR to suit your table though. Theres no reason why 4x+limper needs to be writ in stone.