Yes you are making sense. You are using Jamie Wallen's method of testing bobbin tension. We need to know if the eyelashes are showing up on the top or the bottom. If on the bottom that means your bobbin tension is too tight or you could have a blob of lint caught in the bobbin case spring (which happens to me quite often when quilting with 100% cotton bobbin thread in the bobbin or quilt has a flannel back.) Or your top is way too loose or slipped out of a tension disc. If on the top, the reverse is true, to truly confuse things, I have had the same infamous blob of lint in the spring also make my bobbin tension go way too loose!. Speed can also effect it but for the most part, in my experience, it is usually a tension issue. I can go pretty fast when pebbling and making big swoopy feathers and when my tension is good I never get eyelashes. But if it is off then I get them ranging from teeny to big whoppers.