Ive been obsessed with making a Black IPA that tastes perfect to me and I;ve almost got it down. I've found that the keys are getting the black color with minimal roast character and finding hops that pair with the small amount of roast character.
For the roasted malts. I always, always use midnight wheat. Its the darkest malt you can get (that I know of) and has the least amount of roast. Other options are blackprinz and carafa III. For reference Perla Negra is 340L and Midnight Wheat is over 500L. It'll take less to get it black. Ive found 1lb of any of the above malts will get you a black color, as long as you do a mashout (5gal). I like to add 1/2 of the blackening malt in the mash and the other half just at mashout for the least possible amount of roast while still looking like a stout. I also mash very low and add some cane sugar to dry the body out. I dont want a hoppy stout, it has to feel like an IPA
For hops, I think you need at least 3x what youve got in order to make anything thatll wow people. My last one had over a pound of hops in it. Cost a pretty penny, but totally worth it to see peoples eyes bug out when they took their first whiff. Also, large flameout additions followed by a whirlpool/hopstand is key IME.
Ive found that piney and dank go very well in Black IPAs. I stear clear of floral geared hops after a few wonky beers with them. My favorite combo so far is simcoe and chinook. Still searching for a 3rd hop to compliment. My latest and greatest black IPA hop schedule was:
@60: 1 oz magnum or whatever
@15: 1 oz simcoe / 1 oz mosaic
@0: 2 oz simcoe / 2 oz mosaic / 2 oz chinook
@+30min into hopstand: 1 oz simcoe / 1 oz mosaic / 1 oz chinook
@dry: 1 oz simcoe / 1 oz mosaic / 1 oz chinook
@dry2: 2 oz comet
@keg: 1 oz simcoe (whole) / 1 oz chinook(whole)