You have a good combination, good spooling twins and very fast rail pressure rise, with the ability to maintain it. These increased displacement CP3's will make the pressure come up so quickly, that atomization is greatly increased and unburnt fuel is virtually non-existant. I noticed the same thing, once the rail pressure and boost comes up, the smoke is gone.
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02 2500 Sport SB 3850, DRAG COMP, 2 TURBOS, BIG STIX, BIG PUMP, STUDS, SPRINGS, CAM, WATER INJ, ARB AIR LOCKERS, O RINGS, LIFT 35'S
05 2500 Sport 2 TURBOS, CAM, SPRINGS, STUDS, BIG STICKS, DRAGONSLAYER CP3, C5 MP8 AND PROGRAMMER, BILLET TRANNY, LIFT 37'S