Did you try ENB patch? Not sure your microstutter is the same as mine, but it worked for me. In my case it was like frame skipping when I looked in the direction of certain NPCs. The NPCs didn't have to be visible, so if in a cave there was one NPC a mile away who caused this I would get the stuttering whenever I looked in his direction. A good example is Belethor from Belethor's General Goods in Whiterun, I always got the stuttering when I looked at him. Anyway, here is the link, it's worth a try I guess:
http://www.skyrimnexus.com/downloads/file.php?id=2531
EDIT: I disabled all options but the BSOD fix, which is the fix that removed the microstutter for me. All the fixes enabled caused some minor performance decrease (about 10%), but with only this fix enabled the performance doesn't decrease.