You are doing a good job.
The problem with bring the backing forward as binding IF YOU QUILT HEAVILY is that there tends to be 'extra' binding relative to the quilt. You didn't on this, so no problem. As far as I can see, quilting under the binding is only a problem if you are quilting heavily enough that the edges get too stiff, OR if you have an elaborate quilting design which gets cut off in the process. Older bats required heavy quilting. Modern ones don't. If you are not entering major quilt shows, the whole issue is null.