Im in my phone, so I'll keep this short.
1. The placement of the Bose moves all the time, depending in the room.
2. Mono is not a problem when the system us tweaked to overcome the Yamaha shortcomings.
3. I don't need RH accpmt when playing live bass ... that is only important when the KB links the harmony to the chord section. The outboard harmony unit makes it unnecessary for the arranger to be on, when I play lb bass.

I hate typing on this phone!!! Grrr.
More later