Installed the GFB boost controller and I still have the same issue, running over 12psi boost drops hard around 6800 which means either the turbos are too small (obviously not the case here) or there's too much exhaust flow and it's pushing the WG door open(ding ding ding). Most guys run external WG's which are dual port so they don't have this issue, so I just ordered a set of turbonetics dual port internal actuators.
The way these work is by applying a boost source to the top half of the actuator spring which helps prevent the exhaust gasses from forcing the WG open. Once I install these I will finally get it back on the dyno.