okay, so let me see if i've got this straight.
you've got distorted guitars up in the right and left channels, and the guitar solo panned up front and center, but the solo is overpowering the 'rhythm' guitars?
if so, try rolling off the low end of the solo guitar, say hi-pass it at 175-200 hz, pull down 400-500 hz several db with a resaonbly wide bandwidth (2.5 or so should do it). low-pass between 5k and 7k. sweep it around and find where the harshness that blocking the other sounds is, but try not to lose so much hi-end that the guitar sounds dull.
it sounds odd because usually people have the oposite problem, i.e., the solo doesn't come out enough.