"Eyelashes" is a good description! I found I get those if I am going too fast. It is a lot about learning hand control and slowing down. I had read some place you should try to go as fast as possible. I tried it and the front looked great. I turned to the back and was horrified! Half of the quilt had those "eyelashes" all over it. I too thought it was tension until I read a post on here, I think in the Links and Resources, about slowing down especially on curves.