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
Primary: Saison with WLP670,
Kegged: Celebration Ale Clone (with homegrown hops), Blackened IPA Lucky Hart Farmhouse Ale, Jarl Pils (Noble Pils Clone), Yuletide CarØl
Bottled: Yule Gruit, Unhallowed BGSA (10-10-10), Nymphetamine Barleywine (999)