I should have been more clear. My intentions would be to scale Low Post Defense ratings in a similar manner to the on ball defense being discussed. For example the top end for Bigs low post defense would be 85(maybe 1 or exceptions). Hakeem Olajuwon is really the only center I can think of that was able to shut down his peers(Ewing, Robinson, Young Shaq) on a somewhat regular basis.
You are right I don't the CPU to see Shaq as mismatch against every center.
Also...
If I were to implement the 85 max on ball defense scale into my 90-91 roster, but want to account for hand checking, should bump the scale up +5 or +10 or would a slider adjustment work better.