Ok, first, make sure that with multiple amps/mics you don't have any phase problems. Also, some of those metal guitar tones are actually pretty weak by themselves. Sometimes the best thing about their guitar tone is the bass guitar tone
Anyway, I usually start with a 57 and 421 right on the cone and work from there. I almost always have the gtr player back of his gain considerably, what sounds good in the room usually ends up really fuzzy/fizzy in the CR. YMMV on that tho, I know some heavy hitters (Slipperman) just go with whatever the guitar player has got!
Hope this helps.... If you have a phase problem, nothing will sound good till ya fix it.
Ian