I didn't see mention of the type of display, although it looks like an LCD. If so, can you say something about how you "blink" the backlight(s) to minimize apparent "roll" during fast motion orthogonal to the refresh direction?
I haven't gotten too deep into it myself, but the driver outputs a backlight PWM pulse a specific amount of time after a vsync. It's something I'll optimize at some point, but I have bigger problems to work on right now.