Hello Grant,
It seems you keep trying to reinvent the wheel here, you already know the proper way to map this car as per mine (and others) recommendation (Alpha-N with baro compensation).
Perhaps you did not know this but i also do most of the VEMS firmware development and let me assure you this change is
not related and not helpful for mapping non ITB+Turbo cars.
We think the best way for a street car with ITB and altitude changes is load (global) being calculated with external baro input offset built in, and also having blended alpha-n/map where it's SD for low load, TPS for high load like the megasquirt guys are doing.
In the low load area SD will actually have poorest load indication on an ITB+Large cam car, while pretty okay on high load/high rpm; TPS provides good load indication everywhere. I suspect you have applied reversed logic there
Take care 1.2.32 firmware is not released yet (marked: experimental, only for testing), normal users are recommended to stick to released versions
Best regards, Dave