I use a 20 wookie for my 4 season quilt. Just sold my winter quilt. I find the wookie to be more than true to rating. I've used it at 20 in breezy conditions with an asym tarp and a uqp and was toasty.
Best part about the wookie is you can add a pad between the layers on the odd trip you might need a little extra.
It's also 0 fiddle factor. Colder or gets the more you feel every gap or breeze. None of that with the wookie.
That's my recommendation. 20 wookie.
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