The Miracle Man has quite a big perceived bottom end because as well as bass, the mids that are present tend to be low mids. The scooped element in the Miracle Man seems to be more the upper mids to me. In a Les Paul in a very low tuning, I'd be a bit concerned that you'd end up with too much bottom end, especially if your amp tends to be a bit on the dark side and/or isn't too tight. I think that part of the reason you feel the Impulse is lost in the mix is because, like the Miracle Man, it's a bit scooped. I always like plenty mids from my guitars because they really cut through a band mix well. I think you need something a bit brighter overall with strong mids as well as tighter.
The alnico Black Hawk tames the top and bottom end a bit compared to the ceramic and retains strong mids so should leave you with a very full sounding tone that is good and tight. The Painkiller should also work well because it's bright overall with a healthy amount of mids and very tight. Exactly the same goes for the alnico Nailbomb, which will be the most aggressive sounding of the lot while also retaining more of a PAF feel to it. The A-Bomb is a really pi**ed off sounding pickup that is made to be in a Les Paul. I think that any of these three would be top of my list and my choice would depend on what I wanted my tone to be like. If I wanted a really modern tone, I'd go for A-Hawks. If I wanted a really aggressive, huge and tight sounding PAF-style pickup I'd go for the A-Bomb and if I wanted something between the two, I'd consider the Painkiller.