I'll try to be specific.. and.. talk english(sorry, just in case).
Now I understand why I still don't hear bass. Panned Bass? In Death Metal? What? Nooo.. So this panning may also cause forcing of your guitars. Overall guitar track sounds like "delayed". I mean, no matter what you do it still on the top of the mix and sounds "everywhere"(left,right,center), so as and Bass actually. Hope you understood what I tried to say:banghead:
Drums. Drums are nice but borrowed. Check your mixer's loudness indicators. Drums and guitars loudness pick should be in same dB. At least in my case it works great. Bass pick should be 1/2 from guitars and drums, and centered. Otherwise you'll never make it sound.. mm.. not noisy. I can't say anything specific about drums because I almost don't hear em. But I do hear long delay/reverb/feedback from snare. Cool, but it may ruin your mix. Dunno. But don't touch it for now;-)
"Belly", string, brass stuff. Again, louder then rest of your mix. why? Reverberation, incorrect freqs cut/boost and leveling. The trick is: Brass and strings(specially brasses) has a same(close) freqs diapason as guitars. So you have lot of instruments in same freqs. Reverb increases this coincidence. Bad. Cut those freqs from orchestra's reverb(at least) and listen how it'll sounds. Now Your worst enemy is Reverberation.
Someone pleas correct me if I'm wrong. Good luck with this mix Man. Hope I didn't forgot something.
As for the source.. I CAN recognize it. But I have to listen very carefully for every instrument.. So it could work after some seri..us...sire..ous..e....(fuck. I hate this word) polish. But this mix sounds like remix of your prev remix:P
If you want some help PM me.