Me thinks you've learnt a few new tricks!
Nice choice of song to play about with - you've really highlighted the backing vocals in the last third of the track and I suspect you've used the new remaster as well haven't you? The stereo seperation seems wider than what I'm used to hearing....
Being critical now, was there nothing you could do in the first half of the track? Apart from a segment in the opening 30 seconds or so, it sounds like you've not done anything.
Assuming you're using software that allows multiple timeline tracks, how would it sound if you did a centre channel extraction for that whole section, but then mixed the vocals back in from a second copy of the track on a different timeline using an accapella option....?