That's almost exactly the malt bill I'm going to use to make a Black IPA on Wednesday. The only difference is that I will use a lb of Midnight Wheat instead of Chocolate Wheat.
I made an IPA with that malt bill minus the dark wheat malt. I used Irish Ale yeast and it was f'ing awesome! I vote for sticking with the malt bill you have listed. We can compare notes in a couple months.
Uff Da Picobrewery
Kegged: Vienna Lager, Mánagarmr Stout, Ratatoskr IIPA, Cider
Bottled: Yule Gruit