I was having a big problem with my tension and couldn't figure out why - I feel really silly now but somewhere along the line I started inserting my bobbin facing the wrong way! Go figure. It sews beautifully now - and I still feel like a dunce but it is what it is. I'm only fessing up because my stitches remind me of the way yours are looking - and I am sure I am not the only one who has done that. My brain just twitched and I started loading it wrong.