I changed my mind and ordered a Te-Wa Flurry -- and with 1 oz of overfill to boot.
I figured that it was only an extra 4 ounces over the Antifreeze with 2 ounces of overfill, and the Flurry is designed for 4 inches of loft, where the Antifreeze specifies 2 inches. Might as well give that down some room to do its thing.
And I am always cold (maybe that is why I like Arizona?), so I doubt very much I will regret the extra warmth. I may tackle a lighter underquilt as a DIY project if I find a source for down.
As somebody said, if you are too hot, you can always loosen things up and vent,
but if you are cold, you are out of options.