I've done FMQ with my DSM on two minky backed twin size quilts and at least one baby quilt without any problems. I pin baste mine. On the twin size I did a large meander, resembling puzzle pieces which my little grandkids noticed and liked. The baby quilt had straight line stitching just because it suited the quilt. By the way, I use Quilters Dream cotton batting, the middle weight, can't think of the name right now. I don't think you will have any problem with a floral design. I think you will be fine.