(Gee, seeing that proposed tuning scheme, I'm so glad I finally settled on EADGCFAD for my various 8-strings. My next step will be either a 10-string tuned to BEADGCFADG, or a 9-string tuned BEADGCFAD. I think I can leverage that high G4 string in an interesting way, so I'll probably just go for it.)
to be quite honest (due to my lacking of experience in this field) i was very close to attempting this high C tuning on a 26.5" schecter c8 blackjack.. then realized just how impossible that was to achieve.
so after purchasing a non-refundable left handed 8 string, then coming to this realization, i had already tuned down to drop D# 7string tuning with an added high F (F,A#,F,C#,G#,D#,A#,D#) which in it self shares nearly all the same (open) notes as drop A# 7 string tuning (F,C,G#,D#,A#,F,A#), the tuning i previously had been practicing on and intended to add the high C to.
with the D# 8string tuning, you can still play some of the same bar chords as the C-A# tuning after the 7th fret. its practically the exact same approach to using chord shapes/voicing's. all this means is i have way more options to write material, given the fact i now have 2 different but similar set ups..