My Holy Diver has some of the best clarity I've heard from a humbucker but I feel like more brightness would help with ringed out chords, this makes me think Rebel Yell but I don't know how it would perform for extreme tones (this isn't very descriptive, i'm talking about extreme styles from the rawest black metal to the most extreme grindcore.
I felt that I thought a bit more brightness would help the Holy Diver, and the rebel yell was exactly what I wanted.
I am not too schooled on grindcore, but to be blunt, I am fairly sure it could handle the job. It handles hardcore and thrash very well. (Sorry, but that's what I play more.) I am pretty sure it would do death and black metal fairly well.
The aftermath might do it, but the aftermath is an interesting beast to play. Clarity it has, but it is a very hard to describe pickup to play, and rather unlike most others I have played, exceptionally dry and focused.