I do not know why your stitches do not line up on the front. I think you need to tighten your top tension a little to pull the bobbin thread up into the quilt a little more. I have heard that machines that do a lot of decorative stitches do not line up as well as straight stitch machines. My Vikings and brother have always lined up...so not so true! I think that Juki's are straight only. Is this true? I would clean and oil and adjust...then try try again. Is there a Juki group on yahoo, sometimes those groups have lots of info. Good luck.