I agree Eric. If the base pw is low, then just add to it and not bother with the +/- multiply.
I like the idea of a 17-value rpm table but I'm still pondering your original pe airflow table. From the driver's seat here at the computer, it still sounds like a good idea so I think I'll try both tables.
You and Carl had all weekend to get this stuff sorted out,
so where are the results?