I'm 6' 200# and have both a 1.1dbl SB and 1.1dbl SBLH. I've had a 1.7dbl WBBB, and the 1.1dbl SBs feel more sturdy than the 1.7dbl BB did (and definately more sturdy than my current 1.1dbl WBBB).
To me, a 1.9dbl SB would be overkill for 165#. But that's why we all hike our own hike. You won't be disappointed either way. Great hammocks.
"One of the best things you can do in this world is take a nap in the woods." ~ Jayber Crow by Wendell Berry
"While it may be a lot of work, the view is best from the summit." ~ an anonymous staff member of Philmont Scout Ranch
Enjoy the day