I think Johnny April of Staind tunes "G#, C#, G#, C#, F#" . Its an interesting tuning but seems to work for him
You sure it's not G#, C#, F#, B, E? That is the tuning of a 5 string one and a half steps down which I was probably going to tune my Rebop down to since bands like Pantera and Down use it regularly.
) Forte 6.
I don't think it's so common. Perhaps you're not using enough umph!