There is this theory we were taught in level 2 about how to identify the problem in a plied yarn. When you hold your skien up and it twists, that is a sign of unbalance. Well, of course it is, you say. But did you know the way it twists will tell you about exactly where the unbalance sits? Like if you spun your yarn zzS (single single PLY) and it twist in the Z direction then your yarn has to much ply or to little single twist. And if your yarn, spun the same direction, twists S direction then your yarn has to little ply or to much single twist. Confused yet? Well, it confused me. It still did until this morning. So I did an experiment.
I took a chunk of commercial top and split it (Sorry Marg!!) into four strips. With two of them I spun the ever livin' love out of them. There were snarls and kinks and it felt like rope in the single. I then plied it sooooo lightly to force it to be outta whack. And I tell you, it is.
The other two strips I barely spun. I think I put 1 treadle into 2-3 inches. Not much twist at all. Then I plied it beyond rediculously tightly. I think it nearly has an angle of 90'. This most certainly will make any yarn unbalanced as well.