Thanks for sharing Gvd!
That's the first time I've heard of someone tuning the bottom head lower than the top. I think each drum has a sweet spot, and for to my ears that tends to occur when the drum is in tune with itself and both heads are tuned relatively close to one another.
I can tell Bunker's sound is different than most jazz drummers--and also different than the pitch I commonly seek--but that's exactly what I like about it.
I agree--whether drums or cymbals, you always need to have another drummer play the gear, so you can balance the drummer's sound with the audience's sound.