I use a similar sewing machine for upholstery and the embroidery setting on mine can be adjusted to give different stitch widths and different stitch density (I mean more or less stiches in the same area). I don't have the details for the exact settings on your machine model but they should be adjustable in the same manner. Have you checked this already?
I have checked the tension setting in accordance with the memory card program. Ive cleaned the bobbin case. The actual embroidery is perfect except that it is all white from the bobbin and doesnt show much of the coloured threads from the needle.
Hi - I don't have the expert knowledge you need to assist. Sorry I can't be of more assistance on tis occasion.
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Thanks for your patience,