Hi Brian,
That's a pretty specific equipment combination, but perhaps you'll get a response. The G11 should be able to handle a C11 as far as payload. With my C925 I have gotten PHD2 guiding in the 0.6 error range but have gotten down to 0.4 in excellent seeing. I can't speak as to how an ASIAir would be better or worse since my preference is for PC controlled imaging. The Duo should give you nice guiding as long as you can find a guide star, and I've heard some mixed reviews with NB filters. I typically use the PPEC algorithm for RA guiding but not sure how that works in the ZWO environment. As long as you balance well and do your guiding calibrations, you should be OK to go.
John
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Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user
