What I did was slice in the Boost controller line with the MAP sensor feed. It was a long hose to the back of the manifold, but Boost controllers work on the same principle which is to bleed off pressure to the actuator/wastegate to allow higher boost. So the boost solenoid bleeds off pressure to both my actuator and from the intake manifold. I was able to hit 22psi and did so for a week. However the car survived because I drove mostly at night when the cooler air didn't affect it as much. After taking an AFR reading with the stock O2 sensor I realized that the car started lean and never crossed over into rich at any point, so I realized the danger and stopped. Getting past the FC wasn't worth my engine. I think the fact that its losing air from the intake manifold as well as having a error reading compounded the problem.
Resistance type FCDs create the same error across the fuel map, just using voltage instead of actual pressure loss.