North Face is notorious for their "optimistic’ ratings. They also assume you’re in a tent, on a solid foam pad as an insulator (were you? if not, consider adding a foam pad to sheild against the under-cold, where the down is compressed and cannot insulate. The blow-up pads might not be enough to keep you warm.).
I’ve owned a Cat’s Meow too, and while it’s a lovely, tough, cheap bag in its own right, as a cold sleeper I can’t use it on the higher elevations (3K plus) of the AT from Sept-March/April.
I truly, truly LOVE LOVE LOVE the cozy warm snuggness of my Western Mountaineering 700-plus fill down bag. Their ratings are conservative. Mine was rated to 20 degrees, but I’ve slept in it in single digits and been SOOOOOO comfortable (I have it around my shoulders in the house right now). Granted, outside I add a very light fleece neck warmer/ring (my magic piece of camp and cold-sleeping gear), and a hat. REI long johns if neccessary.
Also, though this probably doesn’t apply to Nunyet’s case, just a side note: I make sure to change to a sacrosant, zip-locked dry set of clothes as soon as I make camp. Nothing chills a body faster than trying to dry wet clothes while wearing them.
I’ve noticed the WM bag has since been rated to 10 degrees, so I suppose they figured out it was even better than they thought. Stumpknocker is still out there (in PA) and using the same bag right now in this super-cold weather.
Sub-two pounds, can’t beat it with a stick. WMs are pricey, but there is a reason. These are lifetime bags. I use my at home when the power goes out too.
Damn! The actual model name escapes me, but google in Western Mountaineering Ultralight series, and look at the ratings. Mine is a teal color on top, should be rated about 10 degrees now. I carried this bag all through March and April, and a little of May. It’s COLD above 3K feet!
I also use a vest when hiking in cold weather, but mine is synthetic fill. Doesn’t compress as bad. Have slept in it too. I love gear with multiple functions/versatility, and this is one way to customize and extend bag range with a piece of clothing.
Sometimes, when no one is looking, I’ll wear the vest backward when hiking - it keeps the trunk warm and wind-free, keeps the arms uncovered for heat dissipation, doesn’t overheat the back to make it sweat (and thus chill). You can invent lots of useful, wacky, innovative things when you don’t have people to reflect your wackiness back at you (or, alternatively, not allow the odd looks to penetrate your equanimity - self-possession, an even greater freedom).

Jan LiteShoe