So apparently Irrational is unable to recreate the stuttering issue on their test PC's per Chris Kline from Irrational. I had tried all the fixes he posted, but nothing fixes the issue.
I don't believe this; the issue is far too widespread for it to not rear its head.
Edit: Unless, as Tummi suggests, Irrational is just focusing on a particular subset of the stuttering. But even so, I still find the claim dubious.