I have a baby lock professional quilter and it stitches straight just great. I get a lot of quilting done with no problems. Then I start doing free motion and I check the back and it doing fine, sew some more and thing are still fine and then I really get into it like maybe a couple of hours and I forget to check the back and my tension goes all loose and makes a mess and when I discover it, usually when the bobbin runs out, I have a Hugh mess to tear out. I think the bobbin may be getting warm enough to warp. I hate this machine! But, back to your problem. Practice doodling on paper what you want to sew , loops, stippling what ever, it trains the brain to do the motions and makes it much easier.