Hi,
I think an HbA1c of 6.3 is really good, and it's come down too so you should be well pleased!
It may come down further over time but, if not, it's still pretty good compared to the majority of doctors T2 patients.
IMHO, the HbA1c is by far the more important number. I personally don't buy into the whole cholesterol thing and I am a statin refuser. Even so, I was bitterly disappointed when my total cholesterol readings went up after another three months of control, dieting and weight loss. This was despite my HbA1c coming down!
This lead to (another) disagreement with my doctor who could offer no explanation but, nontheless, felt that it reinforced the need for taking statins (which I refused again).
If you really want to lower your cholesterol, the statins will achieve that, but I think you should be delighted that you've controlled your HbA1c so well.