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The tuning you have here isn't drop B (B/F#/B/E/G#/C#), it's just two and a half step down standard tuning (B/E/A/D/F#/B). Basically, you just have it tuned like a seven string guitar (which is probably what they use, at least that would make way more sense) without the high E string, and with the G string tuned up to F#. Great tablature work by the way.
Oops, I meant tuned down to F#. Sorry, I was thinking backwards.
God, I was ignorant back then. It's just baritone tuning, all that previous stuff I said about seven-strings is crap, sorry.