i'm using a sb900 (default settings, TTL, -0.7 EV) with omni diffuser usually tilted at 45 deg. to shoot models in IT/car show. i know that it won't be able to bounce the ceilings as its too high. Is there anyway to prevent/reduce the overexposed face shoots with my current flash set up? i'm trying to get the right exposure more evenly distributed. should i use the built in wide flash adapter instead? as i'm usually is around 2-3m from the model.