That can happen because rpm are risng, but the airflow stay almost the same. If the rpm increase with no change in airflow bpw will go lower.
At 220 AFGS at 6600 rpm, I can estimate the engine is around 200 hp. Which don`t make sense with your build.
Post the MAF table to see if there is something wrong with it. The way I see it you need 20-30 % more AFGS from 190 AFGS up.
Shot MAF is also a possibiity.
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