ahhh yes...
well i know what your talking about, i have a metal band in my studio right now!! ha.... Anyway, what i did was make sure there was a lot of attack on the drum sounds. Kick i raised at about 2.5 k with a graph type eq and i changed the Q to about .6 which broadens the range around that center freq. so that is sounded more real as apposed to just raising 2.5k. Then i like to still have alot of bottom so it sounds heavy, (62hz) then i wanted it to be a bit more bright so i pop up 5 db at 8k. This will give it almost a metallica sound, like on reload and load(the 8 k that is) So if you don't want quite as much click sound, then just turn it down, but it has balls!! Also don't forget to compress it... Now next onto the snare. I found that i like to simply first compress the hell out of it... Then eq wise i raise 2.5-3k and a lot and on a tight scale. That way you get alot of snap sound and it really breaks through the mix WITHOUT HAVING TO RAISE TOO MUCH VOLUME!! Another tool that helps kinda set the snare in nicely is reverb. Listen to some of your favorite comercial bands and commercial death metal bands, there are some once in a while that almost burry the snare in reverb and it gives it that polished/compressed sound. It can be a very nice tool if your working with a not so talented drummer... back to eq... Then i give it some more low end so it doesn't sound like your hitting a wall...(150-300hz). Overheads i like to be very crisp sounding. So i lower anything below 500hz and give it a bit more sparkle sound by giving it some more treble. I also give the cymbals a bit of compression, but a very low ratio, say.... 2:1 or even lower. Just enough to take the edge off the drummers crappy playing... ha! toms i just make very full but with a lot of attakc(just mess around with these). Then something else i always do is record with a stereo pair of room mics. This just increases realism and sometimes i just use these instead of a hi-hat mic or ride even. It bascially all depends on how it sounds, but being your stereo micing you will still get that spread or pan of hi-hat and ride. (left right) And just remeber compression is your friend here, dont use to much or you will think your sounds are squashed, but too little and you will have mega problems having the drums sound very powerfull because they won't be at the same db level every hit... Bascially your trying to get that consistant sound. So i hope this helps a bit, and just remeber most of these settings i only use for metal and hard rock otherwise in a normal mix it might sound a bit weird or too polished almost. Now with those guitars, tell them that the idea of putting in a third track up the middle is the worst idea i have ever heard... Especially for metal. I pan mine close to hard right and left, but not too much that it sounds weird. Also bass gutiar is a very important thing here! This is what gives you that hard rock numetal sound. Make it thick, make it bassy!! But still don't forget a bit of presence. And for guitars eq wise i like to raise 2.5k to give make it sound more clear in the mix. and drop a bit of lows. Not too much! but a bit just to let the bass do its job(bass...) Good luck!