Well, we had about 7" of rain in 1 month here and 3 - 5" of it fell in 72 hours. Basements flooded and pools overflowed.
As for the speed issue, I can expose at the same speed as Ilford MGIV paper, so that is not an issue with me. I use papers with high weight for enlargements, and you have seen at least one of these in the class on baryta and one on Strathmore. Mine dry kinda flat, but then maybe adding a humectant like sorbitol might help you.
You could try a 300# paper. It makes gorgeous prints and lies flat. You can make very nice postcards with it.