Its a weakness of the MM in particular that it doesnt like to be backed off. Its pretty much an on or off metal pickup, in my experience. Its great at what it does, but what it does is metal.
Ironically the warpig(s - c-pig as well), painkiller and ceramic nailbomb, all of which are hotter pickups back off better. As do the nailbomb and cold sweat, both of which are a little less hot than the MM, but fairly comparable in output.
For your sounds, though, a very hot pickup isnt really a good idea. I wouldve said the MM was way too powerfull and insufficiently versatile. Black dog isnt a bad idea. Nor is riff raff, crawler, abraxis, VHII, cold sweat.
All things considered, I'd say that I hope that slash isnt the most important tone in there (A2 mule for that, I reckon) and get a riff raff.