I'm thinking seriously about a 7427 swap. Something like EBL would be nice, but since I already have the chip burning equipment, swapping in a 7427 seems to be the best/easiest/cheapest way to upgrade. I would think the more advanced code, faster speed, and higher res. tables would be reason enough to swap a 7747 for a 7427.

In the meantime, I tried zeroing out the IAC vs baro table you spoke of, and it did indeed seem to make an improvement! Thank you