Death Metal Mix...Need Advice!!!!

Filter out everything below 60hz in the guitars. There's some audible clipping, turn down the volume. Try mixing through a compressor if you aren't already.
 
Definitely! 2 more points. Get rid of the low end on all of the cymbals and make sure they're not too loud in the mix. The lead tone needs to be a bit brighter too.
 
you need a mad chebyshev 72dB/octave hi-pass on that, at like 40/50/60Hz, there is some serious trickery going on with the low end on the guitars!

other than that, this is pretty fucking good so far.. dunno what else to suggest!

(the eq'ing i speak of is from here :P - the free one lets you use upto 36dB per octave - more than enough!)

thanks