I have written before about the polyphony of other products in the marketplace that are also advertised as being fully polyphonic. You can try an EHX Pitchfork or HOG2 if you want to experience some ghastly glitches when chords are played. Nobody has clean 1/4 inch polyphony yet. The closest is the Mel-9, which shows that EHX is slowly improving in this area.
Chrish, you have two SYs, right? Mapping the six oscillators across the fretboard would be very interesting to try. I am going to try it with three oscillators. It isn't likely to be a great solution though, not just because it reduces the richness of having combined voices but also because many chords will have more than one pitch per oscillator, still producing glitches.