Only had a chance to listen to the first four tracks so far.
As a comparative newcomer to this mixing lark, take all this with a bucket of salt, but to my ears:
Love the tunes, they're bangin'!
Drums sound nice and clear (although too low in the the first two tunes) but the rest of the mix is very muddy - where there are vocals I can hardly hear them.
No idea what format you have the older tracks in - have you still got multi-tracks or are they just stereo mixes of each one? If it's the latter it might be hard to clean them up - sounds to me like there's too much reverb on the guitars and mud in the eq.
Really great tunes tho - I'll try to give the rest a listen soon.