Carl,
I guess I was thinking that dropping the PE vs. TPS table would allieviate the need for any "negative" trim. Whereas now, if I set the whole PE vs. TPS table to 50%, then I have put -50% in the lower PE vs. RPM ranges to get back to a "normal" A/F.
For the 72's, I was assuming PE A/F vs coolant at 14.0, no TPS trim, MAF pegged at 255, PE vs RPM at 200%. This should give a commanded A/F of about 4.6 (I know, not real). That should calculate out to a pw of about 26.6 at 4800rpm. (There are other things that will affect it, but you get the idea.)
Eric