Mike, have you considered water/methanol injection? It cools the air intake charge significantly. The technology has come a long way, and it's worth looking into. I'm more than likely insulting your intelligence by suggesting something you know even more than I do about, but I figured I'd throw it out there anyhow.
I would if I was concerned about cooling an intake charge under boost or to try and keep detonation at bay, but that only works when a preset parameter triggers the injection. (Sitting in traffic w/ the A/C on is what I'm worried about). Running E85 would keep the engine cooler simply as a byproduct of it's usage. I know it's overkill for all other aspects of my combination.