Well done on your 4 stone weight loss last year and reducing your levels. This is an amazing achievement to push back the disease and the risks of complications.
Hba1c test gives a crude average so it will not reflect your highest levels. I have never been diagnosed diabetic but my FBG was 6.7 this am. After gentle exercise and pre lunch and dinner l am in the high 4's
Your meter could be reading high and you could test this by requesting/purchasing a control solution.
Now you will have to decide if you can, using the tools on this website/forum, do anything more to try and get your FBG lower.