when i record distorted guitar i always do two tracks. i like a warm sound with a little punch, so i set up my amp's eq with a lot of mids and medium highs and lows. then i record one track with the neck pickup of my tele, and one track with the bridge pickup.
i think it sounds great when you have a distinct sound on each side, rather than the same sound. although the pickup thing woudn't work for metal because neck pickup for metal guitar is usually a no-no. also, metal is big on scooped mids. what i'd do is do one track with very little mids, and another track adding enough mids to make it sound distinct from the other track.
if it still isn't heavy enough... do two more tracks!