Take a long and honest look at how you sleep together through the night.
Some folks can spoon all night long. My wife and used to, but now we've both become very restless sleepers.
Initially a 20 ounce down double quilt, with a wide draft flap at the top-center did the trick. Minimal weight, and the ability to control temps by opening/closing the edges. We snuggled, rolled in unison, were content, and warm.
Now we have individual Nunatak Arcs. We toss and turn, get warmer, get cooler, sleep on a side or back, and don't worry about bothering each other. We get better sleep. It added a pound to our total weight, and is worth every ounce.
BTW, an Arc is big enough to adequately cover two. ;-)