Given the Floyd, and wanting chest-thumping bass & lower mids, broad mids, lots of upper mid cut with just enough sizzle & bite but no ice pick... That exactly describes a PATB-2 Parallel Axis Distortion. Which also adds improved sustain and accentuated harmonics thanks to the polepiece structure. Parallel Axis is designed to give better string balance, particularly on floating bridges.
The PATB-2 tends to heavily compress, but it's still got great string separation and articulation. Just a perfect metal pickup.
Check out
daemon barbeque's stuff and note that's through a POD--it sounds even better pushing a tube amp. He also had some samples directly comparing the SH-6 Distortion with the PATB-2 on his other page, but my search-fu is failing me. Flagolated Demon Cookies is a good workout of it's harmonics.
The Alt8 does some interesting things in some guitars, but the heavily distorted clips with it that I've heard have a funny mid notch. Kinda cool but a bit strange. If you don't like that one property, you might do better with something from the Custom series (or a PATB-1, the Parallel Axis version of the Custom 5) magnet swapped to A8.
The Custom 5 or PATB-1 (I have a PATB-1 in my basswood RG570) are interesting pickups, but have odd hollow mids thanks to the A5. Not metal scooped, but it's there. Great bass & upper mids, though. I like mine, but am planning to magnet swap to A8.
Custom 8/PATB-1A8 are less compressed, more flexible pickups, but still high output. Attack and thump like a ceramic Custom, sweeter highs more like a Custom Custom, though not quite as smooth. Widely described as oddly open feeling for their output. Great all around pickup, awesome for metal but can do rock and blues.