Sounds like your truck is defueling...once the MAP sensor see's 20+ psi, the computer defuels the engine to protect from overspeeding the turbo. You need a boost fooler to keep the computer from seeing that much boost pressure.
Here are a couple examples...
Driven Diesel Overboost Annihilator
Lariat, CC, SB, 4x4 Off Road, 7.3L, Auto Trans, 3.73 LS, AIS, Zoodad, Autometer Ultra Lite Boost, Pyro, Trans & Fuel Pressure Gauges, Walker BTM, IC Tube Foil Delete, DR 2" Leveling Kit, BFG A/T 285's, Door Seal Mod, Tranny Magnefine,
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, Harpooned Tank, 4" rear blocks, ITP Overboost, DP-Tuner F6 No Start, Stock, 60E, 80E & 80T, JW Valvebody, PowerSlot Cryo Rotors w/Hawk LTS pads, Bilstein Shocks, Dieselsite Boots, Dieselsite Coolant Filter, Dieselsite 203* T-Stat, Prestone ELC, FRx R/R, IH Bellowed Up-Pipes, '08 Diff Cover, MBRP 4" Turbo Back Exhaust
To Do/Wish List: Turbo-Master, Wicked Wheel 2, Adrenaline HPOP