If you were diagnosed in December, is it not maybe just a little early for another HbA1c.
I know it doesn't seem like a very exact science, I have read the following from several sources "The test is limited to a three-month average because the lifespan of a red blood cell is four months (120 days)."
Hopefully your sterling effort to get BG down will be somewhat shown in the result.
I had a very iffy HbA1c in December which I'm currently trying to resolve, but my GP has said have another HbA1c at the end of March.
BTW, if you're interested, and don't mind spending some of your hard earned cash (meant in a nice way), there's something called A1CNow so that you can do your own HbA1c. I'm going to get one of these tests to coincide with my NHS GP test to compare it's accuracy.