A couple observations-
1) Having watched Bill fly locally and heard his comments about F2B results, I am convinced that he deliberately flies differently in F-2B than otherwise. Here, his corners and bottoms are quicker and very clean, perhaps sometimes on the low side. There, he flew higher, did larger maneuvers and rounded out the corners. He speaks diplomatically, never to me disparaging the preferred corners, but leaving no doubt that he prefers the cleaner - more pristine appearing ones that also leave slightly longer sides in square maneuvers. It seems from internet comments over the past few years that F-2B corners might have tightened some, but nothing I saw there was like the (bobble-free) sharp corners I've seen him do around here. I did not think his WC flights were as "good" as what I was used to, but I believe he deserved the win.
2) My comments on Berringer's performance came from watching only two (three?) last-day flights, one of which was not from directly behind the judges, but rather close and downwind.
3) I think Berringer is quite good and flew quite well. His intersections were about the same as Bill's (not perfect that day), but on all the flights I watched, the plane wiggled after corners, and the repeated figures and adjacent figures were not as close to the same size. I felt that Bill's rounds were more circular, but then as a certain multi-time oriental champ showed, that was of little concern to anyone but perhaps me. That particular pilot flew diameters and tops that differed by as much as 4-7 feet on his worst scored flight (hard to judge higher in the hemisphere).
If I were to guess, I'd say the plane's wing with it's small flaps and apparently forward c.g. needed a high aoa, perhaps near its stall, and the small stab wasn't as stabilizing, even on the longish arm. 'could of course be wrong, but that would explain what I saw. It's a neat design, but I'm not convinced that it is what a guy of Berringer's talent needs to do his best. FWIW, the most impressive single flight I saw the last day was done by the other Mr. Walker.
As usual, FWIW...
SK