This time I decided to eyeball and cut the curve of the last patch.
I drew along the edge of the cut curve. That line will be the guide for the pressurefoot.
With right sides together I stitched along the line. About every 3 stitches I stopped to adjust top and bottom fabric raising the pressurefoot if necessary.
After stitching it looks somewhat messy.
The seam is too curved to stay flat so I clipped it.
The patch is flipped and it looks OK now.