44 diagnosed a year ago with type 2, changed diet to very low carbs, A1c at 6.6, but concerned that it is not low enough. Metaformin 1000mg.?

Consult doctor. Your A1c is at a good level and more rigorous control may not bring more benefit. It is not a good idea to be managing your medication yourself. Please consult your doctor who has more information about your health.