You have 10% (!) reject rate, your cards run over 80c and your WU averages at 833..
If this 2400w-2500w is true.. than wooha man, each of your GPU is eating 400w-416w, that's crazy.
I got 3x r9 290 and I'm getting 800wu, with 3% reject rate (on middlecoin) and my cards only eating 250w~ each (and they run at 74c-78c)...