I would look at some of the Western Mountaineering bags that are close to but not at 16 oz. The Highlite is 20 oz size large with stuff sack, and rated I think (I forget) at 45 degrees. I am 6’1 210 and had to sell it because it was too confining for me. Their are many WM bags that are nearly that weight that are quite good. Instead I would maybe look at at ID Sil Tarp/Equinox Bivy combo with the bag that you do have instead. Your weight would be the same and it would give you considerable options in sleeping at night. More times than not, I don’t even pitch my tarp at night and sleep under the stars. I hike almost exclusively in The Sierras and just love sleeping under the stars every chance I get. If this does not work out for you, check out some WM bags.