As promised, here are photos of the yarn I spun with the spindle over the weekend.
I'm definitely getting the thickness more even, but I still have a lot of low-twist fluff spots. I really put a ton of twist in the first yarn, and I was thinking it was probably too much, based on the little pigtail twists it wanted to make when I was plying it. With this yarn, I put in less twist, thinking that would be better, but I'm not sure it is.
Notice how it hangs straight down without the hank wanting to twist--I made balanced yarn!