I would get a 20º UQ. Learn to vent it by sliding it up towards head to create a gap or pull it to the side until you need it in the AM.
Boost temps with an underquilt protector and proper techniques on staying warm in camp. Don't go to sleep cold. Jumping jacks help.
Some do well and some fare not as well trying to push the rating of a UQ.
You can't expect one piece of gear to do it all and cover 0º to 60º and not have to work at it.
You could always supplement with a pad.
Shug
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