Careful now, that 5% drop where you are may be too much. I think your dead on your sweet spot right now and honestly, would not monkey with it any further. Give it a shot an see I suppose.
I wouldn't mess either. Don't forget that there's a varience on all INR. If your range is 2 - 3, most of us would consider 3.2 "in range". People start playing the Dose Change Game when they start changing doses for such a slight out-of-range #. And then their INR starts bouncing all over the place.