Yes, polyphony has been an issue for me too; however, after having installed on my 9000 pro the PLG150-PF (piano) board, which adds 64 notes to the total polyphony (126+64=190), I haven't experienced note drop-offs anymore, not even when I play eight notes chords with three sounds layered in the right part.
:-)))
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.