[PaleMelanesian]

Ok, I mis-spoke. I'm not out.

The data in that study agrees with my experience and that of others. Perhaps your tires were only touching in the middle because they were already worn on the edges from underinflation, and now with higher inflation, they went to "flat", but since the edges were worn, they did not touch. I assure you that my tires are on the ground all the way across the tread.

I have informally tested traction, as well. In my limited, non-scientific testing, it's at least as good now as it was at Honda's recommended 32psi, on both dry and wet roads. It's not as good on loose gravel. Since I've tested that, I can make informed adjustments to suit when I'm on that surface.