This whole back-and-forth has given me the idea of a horizontal panel to please everyone.
It's made of the pulldown screen material, and connects to either end of the 'wall' space. It's 2-3 ft 'tall' and as long as it needs to be.
You set it up so the bottom is just below the horizon, as seen from where you're sitting in that area. It extends up the 2-3 ft, blocking the last couple of hours of intense sun.
A majority of the 'wall' facing west is still open air for breezes, and the worse bit of the intense sun is blocked.
Patent pending...