I haven't checked the fuel trims with the maf unplugged.
When I replace the maf on Wednesday, I will take it for a quick boot around the block before I swap it in and check the new values with the new one. The issue is now that the trans fail safe mode is on so performance and driveability are impacted.
It definitely runs better with the maf unplugged. When it's plugged in, it idles like it's ready to stall.