I follow the logic of "you can't raise and lower the E's at the same time". Although, actually, you can, but why would you? You'd end up with no net change. But this obscures another truth, irrespective of the 10 string/12 string thing: having E's raise and lower on the same knee makes it impossible to go from the 2nd note of the scale to the third smoothly. No matter how slick you are, there's always a "dead point" between raise and lower - a step in what would otherwise be a smooth movement from one note to the other.
So if you want to make that move, it pays to have raise and lower on separate knees. But it all depends on what you want to play I guess. We can adopt a standard setup, or do something different. So long as we have a reason for our setup, who cares what we do? For instance, after thinking a lot, and talking to a lot of people, I have just made the following changes to my setup:
1. Removed my "raise 7 & 1" change
2. Lower 6 instead, and raise 1 by two semitones, and 2 by one semitone, on the same KL movement.
3. Separated E's raise and lower.
Time will tell. But thinking about what we do is part of what we become. I don't believe any good player just happened. There's a lot of analysis in it.
Will



