Hmmm - one thing I've noticed is that corners turned one way are always a lot better (often almost perfect) compared to corners turned the other way... you can even see it in the samples I did - the turners where I had to turn clockwise fare better. I'm thinking that when you turn the fabric to make a corner you are twisting the needle and bobbin threads. Perhaps a small clockwise turn is okay - but anti-clockwise has a negative effect. What do you think? Balderdash or?
(This still happened when I changed to a new 80/12 Schmetz Universal needle too, which I did after looking up info on the 50wt cotton and realising that most people say it should take the 80/12 needle - not the 70/10.)
I've tried always turning the fabric clockwise but that can require a 3/4 turn and the "normal, better turn" is a 1/4 turn. That 3/4 turn doesn't look great either on the bobbin side.
Thanks again for any thoughts on any of this... Megan