JC - a couple of ideas.
I only have a semi-functional DAW at the moment with no UAD so I was hoping to give exact Cambridge or Pultec settings but instead, just generic will have to do.
See if you like a low shelf @100Hz, +2db.
Also, try adding ~2db at about 2.6Khz with Q about 2.5. I'm not certain but I think it gives your vocals a bit more edge, if not the whole mix.
Now, going dry on the Wurlitzer (it is one of these right?) was a bad suggestion - sorry!
Do you have an convo reverb like Pristine Space? If so, try using the Lexicon PCM91 \"Room22Chmbr\" impulse on the Wurly. I just left things at the default settings with dry at unity and wet at -9.6db. Totally dry was a mistake but this impulse gives just a bit to take that dry edge off.
Actually, it works quite well (within reason, ie, cut the wet more) on the entire mix but this is probably not a \"keeper\" effect.
Also, something that I can't prove but it sounds interesting here. Use the same impulse on your main vocal. Now at the point when you sing a decending bit at 1:04 to 1:09 (and other bits later with the same motif), try reversing the impulse! I can hear a neat effect here but I can't tweak it because I only have the full mix. Would be interesting to know if, a, you like it and b, does it work and c, can it be merged without being too disjointed.
Liked the extra decoration in the drums at the beginning BTW! Would still like the kick and snare to be punchier though. The drums sound too soft overall to my ears and if you want to move the song away from funk into more solid rock, the drums need to be stronger to emphasise the straight 4/4 rhythm.
Regarding the \"tchew\" in the vocals at 3:06, I can't find a way of curing this. Seems like the artificat is too broadband to be able to get away with a brief automated high Q cut.
Anyway, interesting to experiment. Hope some of this is useful.
Mark