Try plying the yarn. That will take out the little bit of extra twist you have in the single AND with the extra twist gone, may make the yarn a bit softer.
For 'single yarns' (non-plied), try to only have just enough twist to hold the yarn together. This is harder to do with short staple fiber.
You really don't need to use the groove in the whorl ... none of my spindles have one.
Your felted sheep look wonderful!!! I think they look like baby southdowns!!!
Oh, the Crimp in that fiber! :swoon: