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I'm needing to sew a thin plastic strip on the bottom of a vinyl seat cover I made for an old GM vehicle to anchor it to the bottom of the seat frame. The problem I'm having is even with very loose bobbin tension and very high top tension set on my machine (Yamata FY5318 - same as a Consew 205RB) I can't get the knots in the stitches to pull thru the plastic (which is on the bottom while I sew) to make a satisfactory seam. I've tried sewing it with the plastic strip on the top but it turns out even worse. I'm using a size 20 needle and size 92 nylon thread, and I have the top thread tension set about as high as I can without the thread breaking. The only thing I can think to do (other than accept that the seam is going to turn out badly) is to use thicker thread so I can turn up the top tension even more to try to pull the knots in the seam up past the plastic to where they should be in the middle between the two pieces I'm sewing together.

Any thoughts or other suggestions on this would be appreciated.