Good info
An interesting point on the U-2: Because of the high camber wing, at altitude, higher pitching moments at high speeds resulted. Kelly Johnson developed the "gust control" setting, setting the ailerons up 10 degrees and the flaps up 4 degrees thereby moving the center of pressure forward and decreasing the tail loads.

I guess differential ailerons and mixed rudder should be enough, but I think I may still wonder till the first flight.

I had a knights of the air U-2 ducted fan which I could not roll out of about a 60 degree bank and I didn't think I was slow. Another turbine U-2 had a similar end recently. I'm not sure these were stall related.

Thanks
Jack