I’m still trying various types, and so far I would say the most vigorous pole beans have been fortex. Like you mention they shut down in high heat, but none of mine died, and began producing till frost. It could be conditions and not bean, so hard to say. Really only fortex has impressed me. I did have a purple that was decent too, Purple King, Last year I tried Blue Lake, and you have about 4 kinds of Blue Lake for one. Bush, pole, light, and dark bean. I had dark pole beans. They hardly grew. Trying again this year.
Fortex beans are long around a foot! Purple King was large too.
