I've since tuned all my guitars this way, in 4ths. My 8-strings are G1 to F#4, my 7 will probably end up C2 to F# or G1 to C#, because on the 8s the 7th string is C and the 6th is F, so they'll all be a happy little stringed instrument family. My 5-string basses are also tuned half a step up, so...