I have the Deco 330 and haven't had the problem you mentioned. Does it do that on every design?

I purchased a Deco 330 for the same reason...to make larger designs. I found that it messes up every outline. I believe it is because the design of the machine is terrible. The hoop moves all over the place because of being connected in only one place instead of two (like every other embroidery machine). It is especially impossible to embroider on towels or heavy sweatshirts because when the material touches the side of the machine or pulls just because of the weight the hoop moves. I am interested if anyone else is having the same problem.