Hey dude, I missed this one- apologies.
It doesn't sound bad to me, dude. But if you wanna tweak it:
Try using compression on the vocals to keep the levels fairly consistant, EQ'ing them a bit (less wooly bass, a little more upper treble) and panning them like-
vox 1- centre
vox 2- 20% to the left
vox 3- 30% to the right
Although they're actually singing the same part, it might sound better with the vocals all the down the centre. Try panning the guitars about 50% to either side to give the vocals "space".
