I too hand quilt, for the last 12 yrs and I use Coats and Clark all cotton, glazed and. I have one of those bees wax things, but never use it. I have other hand quilting thread that I paid twice as much for, but it is too thin.Her is a picture of the one I am working on now.
It's not wrinkled, just was folded up and needs ironing, that is white C@C thread in this. I couldn't find anywhere on the spool about the weight, but it just always feels right to me. I too have wondered about the thread from there , but was afraid to order it, scared that it also might be too thin.