Guitar Fretboard Diagram Tweaks

I often end up creating mini exercises for guitar like this. A few issues from my perspective:
1) I need to add fretboard dots (currently use massive text full stops greyed out!)
2) I can't add 0 (open string) and dots on fretboard at the same time (I current just add massive text O)
3) The current implementation of the open string note uses a different sized larger circle that is not directly attached to the fretboard diagram (current I don't use open string fretboard diagram and just use massive text O)