I think part of the issue is you don't have enough compression for the cam you're running but I think you already know that. Have you thought about advancing the cam to build more cylinder pressure? It's free :lol:
Another thing that has occurred to me is the vacuum spivy is very close to the booster so maybe it could be affecting the air flow nearest the booster? Could that be causing a change in fuel distribution. Also as the airflow is faster in that area is that affecting the vacuum response to the vacuum pod. Just thinking aloud here.