Maybe you try too hard and are overcorrecting too much. I used to do this. Slow and tedious. Finally one night I thought I would just put the pedal to the metal in order to get done. And use the quilt in a dark corner of the living room. Actually, it came out pretty good and my SID was so much better when I wasn't "on top of it" all the time. Just a suggestion. I have one machine that is way better than the other for SID'ing. Don't give up.