Well, it seems that even with my going inside the machine to adjust the tension spring, the machine has somehow gone back to lashing on the underside of the quilt, regards of what I do. I've retired the machine to regular sewing, which it does very well.
I am now looking for another sewing machine with a throat area of at least 10 inches to the right of the needle. My Singer only has 6 inches, which is adequate for piecing..
I have yet to find another machine with a 10 inch throat that isn't costing $1500 or more. Any suggestions. Seems I am starting all over on this.