How did you "pan" the drums from a stereo file?
The bass, voice, rhythm guitar, kick and snare are fighting each other up the middle.
Trad would have the kick n snare + bass up the middle. OH's would throw the cymbals L & R.
Voice up the middle - replaced by lead solo when appropriate.
Rhythm gtr panned one side & another rhythm instruments or double take of RGtr on the other side.
The struggle in this mix is that competition up the middle. bass and kick fill in the centre bottom snare upper mids and voice in between.
IF you start your mix in mono (not the mono button but everything up the middle) and EQ things until tyhey don't overlap too much and sound good then simple panning, as mentioned, will work a treat. IF it sounds muddy and messy in mono then you need to relisten & rethink.
GOOD song by the way.

Cheers
rayc
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