I can't find a specific source but that seems to be the gist of what I've read a few places and what I've heard in person from friends. In fact, Georgia Tech ECE posts their average GRE scores and their average AW score is 3.8, while their absolute minimum is 3.5, which seems to sort of hint towards this.
I've though about this again though and if the GREs are in fact more of a filtering cutoff then a pure indicator, then it really shouldn't make a difference which score I pick.
@Drstruct, if you need to pick one of the two, I would go with the second score. 166 is a really impressive verbal score - like top 10 humanities program score. If you are ESL too it's even more impressive, and I think an adcomm would make note of that. On the other hand I dont think the difference between the AW scores isn't really that significant (on my second time I scored 0.5 higher even though one of my essay conclusions was literally 2 sentences long)