Can't help with the tension issues. I found that the jagged curves and the uneven stitches come from my movement of the fabric. I got the slider thing for under the fabric and I got steady betty hand grips for moving the fabric top. Then I have to be really aware of the quilt and how it is laid on the top of the table. I have to stop and adjust a lot, but it works for me. I have almost elimentated the sharp curves and the jagged corners and such. Practice, practice . . . . No where close to show quality, but getting better each time. Good luck - one day it will start to work.