I survived the night! The weather on the phone said 7 degrees, my Accurate on the ridgeline had a low of 12 with wind gust up to 30 mph. It’s my personal best either way.
I used my Superfly, 20 degree HG TQ and UQ. I had my UPQ underneath and slept in merino tops, bottoms, and socks. I had a fleece toboggan under my black rock hat. About 4 am I got a bit chilly so I covered my TQ with a poncho liner, tucking it in underneath me. I also put a reflector pad in the footbox. I was warm, but not toasty since I was pushing (exceeded) the limits of my gear.
For the gear I presently own, I don’t have the desire to try and go lower, but I know how low I can go.