Pan, I think I might hit you up for some help with adjusting my nest.
Last night it only got down 20 degrees where I was it. I was using my nest, hammock sock, ccp, midweight top/bottom, socks, and 20 degree bag. I wasn't chilled, but I wasn't warm either.
On a previous trip it got down to 15 or less. I was directly exposed to the wind next to a lake and using the same setup. I was almost sweating that time.
The only thing that I can think of is that my underquilt was not adjusted right this time. It felt like it was tight enough without being too tight.