well, i dont think that 8 would be a problem for G.. i mean, i've got the 9 on F#, and the schecter's a 26.5" Scale. .i've done some bends on it and whatnot, and its staying put just fine. I'm probably gonna take a whirl at messing around with the string tension calculator and see if i can't come up with a decent set of strings...
Edit: Anyone know where to get 7 guages? According to some calculations, that would put about exactly the tension i want on there... but i cant seem to find them on just strings..