I wouldnt run Mobil 1 gear oil. Just run the OEM stuff, or the gear oil cocktail if you feel like spending $60 on tranny fluid.

Check what size restrictor pill you have in your wastegate line. If its the wrong size it'll cut down your boost, also make sure everything is connected to the boost control solenoid (under the cover near the passenger side strut tower). If everything mechanically looks good you might just want to reset the ECU.