tim -- don't have a Autothority MAF, but do have a similar one and ran into a similar problem a while back -- turns out that on mine, the MAF's hot wire became dirty and the dirt compromised its ability to accurately detect/report the quantity of air flowing across it. Was able to use some MAF cleaner to bring it (and my carrera's performance) back to stock
not sure what my mechanic used, but here's a link to a MAF-specific cleaner --
https://www.amazon.com/CRC-05110-Mass-Sensor-Cleaner/dp/B000J19XSA/ref=sr_1_3?keywords=maf+cleaner&qid=1565644518&s=gateway&sr=8-3
Are you using a k&m air filter? understand that over-oiling one of these can result in premature crud buildup on the MAF hot wire.
Might want to check that out first?