Sue, the impoetant thing to remember is that YOUR D is different from anyone else’s.
Like you, I found it v difficult to scrape my hba1c down through the low 40s. It was much easier to reduce the higher numbers.
My suggestion is to get yourself one or two Libre sensors and carry on doing exactly what you are doing now. That way you can see exactly where the problems lie. THEN you can make minimal targeted changes.
If you start flailing about with half a dozen diff changes at once, you will never know which ones make the difference.
Hope that helps.