I think you are doing well, as everyone said it is 'practice, practice, practice' that makes you an expert.
I would suggest that you go back to blocks that had the 'backward' stitch and just rip out those few stitches. If after you have practiced a while you may be able to line up you sewing machine stitch and just go over those points.
Or, you can try to mimic the stitch by hand-stitching just those areas. That may be the easiest thing for you to do right now to correct those points. Since you would only have to take out those couple of stitches at the point, I am sure you can go back over it with a hand-stitch and you would not even notice it. Especially after the quilt was washed, you won't even see those places you went over.
This is just my humble opinion.