Hello from ITP! Different take here as I'm local and have a pretty good idea of what sort of temps you're camping in. The Jarbridge should handle them. My guess is that you need to tighten up the quilt to ensure it is most definitely against your back. You might want some of the AHE trangle thingies to help with keeping the quilt pulled up on you. What's your foot insulation? I presume a foot pad, but would just recommend that you think about insulation for your feet - for me, as my feet go, I go in terms of being cold (as long as the back side is good). And last but not least, you didn't mention what you're using for a TQ?
Now, that said, taking care of the wind does become a priority. If that can't be done with site selection only, then doors become very valuable. Otherwise, the UQP is a good supplement, but I find that I rarely take mine backpacking anymore. Dutch makes a vented sock that you might look at. I have the "summer" version which is all net on one side which I really like - net holds a little heat in and I get wind protection on the bottom. I can also use as a winter overcover, which is fine to lose wind protection on the bottom (net) because I'm typically not using my doors all closed up any other time. Otherwise, I think you have a decision on what to do with that Hennessy Hex... you could keep it and add doors from 2QZQ for about half of what a new winter tarp costs. I added cuben doors on my Tox which keeps the weight down, and frankly, I really like having some translucence when I'm in all closed up mode.
Speaking of cuben, its not really fragile, but it might require a spec more attention to detail with setup. If I was buying a winter tarp and could afford it, its the way I would go. Getting that weight/bulk savings for all of the winter tarp surface area (material) makes it worth it.
p.s. you may have all the things mentioned above on the quilt covered, I just don't want you thinking that the winter tarp is a panacea for keeping you warm... it really is an art, and therefore a learning curve, to get everything working together.
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