What I want to share with you now is what I have learned about straight stitch plates and feet.
Here is a picture of my standard plate and foot, and of my straight stitch plate and foot. You don't need to be a genius to see that having the action part of the stitch over top of that open space (wider the zig zag your machine does the wider the hole in the plate and foot - mine does 9 mm.) the more wobbly your stitch is going to be.
The effect on switching to a straight stitch plate and foot on my stitching has been dramatic.
For example when I stitched around my collar my machine marched right along without any hesitation, not a skipped stitch, and no "hump jumper" needed.
What a relief. The only errors made were in the chair.