I like a short scale, (24,9”), but for me it has more to do with my limited span than with string tension. The difference in tension between a GC and a GT is approximately 6%. Dropping the GC to extra light strings would be more effective. The 1/32” difference in nut width changes the space between the strings by just over .006” per space, (a little more than the thickness of a human hair). I already have an 812ce 12 fret, (X braced), so I won’t be running out to get an 811. That said, if I didn’t already have the 812, I would probably be seeking the 811. If they come out with a 521 I will probably be interested.