heres my idea, i dont know if its a good thing or not...
you have 2 tracks of guitar, cant you "double" by editing them?
lets say you have one riff played two times, keep the original guitar tracks untouched, but create two other tracks with the second time in the place of the first and the first in the place of the second...
is it understandable? i dont know if my idea sucks or not, but at least it wont be the exact same tracks just copied