I would recommend making something with your white slubby yarn. I really want to see what you make with it
I'm also a wee bit impatient, so the sooner you work with your slubby, the sooner I can see the finished results.
As for wearing wool in the summer, I have heard that from several sources. It's incredible for temperature variances, but it makes sense. Those sheep are just mammals and they would surely collapse from over-heating if the wool didn't have some way to release heat. I can't wait to make a wool sweater to test out that theory.