I'm too lazy to look up the other races on the days that Z ran to debate your claim. (I've recently written some code that would easily do this but it doesn't cover her early races.) Of course, I find it unlikely that a horse can run a single style of race and win 11 in a row doing so. We both know that most of these horses are only as good as their setup ('pace' in your language).
RA can demonstrate that she's better than Z. All she has to do is come west, where her 'pace' advantage won't be as 'advantageous'. Jackson isn't afraid of a FAIR race, is he?
As for POLY, all I know is that it is the most 'precise' surface out there. I don't play with any figures at all, as you well know, and POLY allows me to play angles that I can't even play on turf; let alone on dirt. Honestly, I just don't see the bias thing. I see fair racing, where timing of moves dictates who wins.