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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Not that I want to push you to anothers website.. but stangtuning.com has a very good forum for the PMS. You'll also want to let us know on your combination and what your expectations are. Do you have a way to datalog or look at the AF ratio?
i would (and do) leave the fuel in low and medium tables at 0%. according to my wide band the stock ecu does just fine keeping a good afr so why change it. i usually add 2-4* timing depending on the rpms (more timing in higher rpms). but you dont really hit 6000rpms in medium load so imo medium load adjustments above 3000rpms are pointless