I'm trying to learn to free motion quilt, read the books, practiced, practiced, My problem is the thread tenson, it always loops on the bottem. Am using a Simplicity Quilter, have cleaned and oiled, changed thread several times,still can't get tenson right, looks better when sewing forward, but when I go side to side or backward loops, yes I lowered feed dogs, going slow, or fast does not make any differance, any help would be much apreciated. as it has a drop in bobbin, don't know if bobbin thrad can be tightened.