Maybe have a look at @guineapig’s training log and formcheck threads. Myself, chris_ottowa and Vincepac1500 been helping him out for two weeks and his sumo has gotten a lot sexier and just in the space of a few weeks has gone from 170x5 to looking like he could rep 180 for days.
While you are pretty much stronger and bigger than him I daresay he out deadlifts you by a little bit without being some long armed short torso/femur looking freak so you could probably learn from his work with bettering his deadlift and all the tips that were given to him.