I warned you about using a tarp in big sur in winter, lol, particularly at altitude. Keep in mind that a so called 35 degree bag is probably a 45 degree bag at best, I totally ignore anything except the 'comfort rating' of the bag now, the rest is just nonsense as far as I'm concerned, but the comfort rating will tell you roughly what the bag is good for in real conditions, and will also allow you to meaningfully compare different bags. So a well used 35 degree synthetic bag will have lost loft and you'll be shivering in freezing cold. Here's the trick, when you see 32 as the rating, think 40-45, when you see 20, think 30, unless it's the actual true en comfort rating, or very high quality or overstuffed or from a small gear maker like zpacks/enlightenment. Even western mountaineering uses the mid ratings, without even having the decency to tell you that, not the comfort ratings, on their bags, much to my annoyance. Their supposed 35 degree bag left me cool at 50, absurd really, but totally obvious since it has sewn through baffles, which can't possibly be warmer than 2 layers of thin nylon at that point, just as an example. What you wanted on that trip was a 20 degree en rated comfort level bag. Or 30 at worst with a lot of extra clothes to wear that doesn't get wet during the day.
Congratulations on getting hypothermia, big sur is where I got that too the one time I got it, which is when I stopped using certain types of gear that just doesn't work in cold/humid conditions where you are doing something harder than a one day in/one day out type hike. I may have gotten it once in Norway too, not sure, though it wasn't as bad. Norway is also cold and rainy and humid.
A tent would have made a huge difference some of your nights, full wind protection, and those extra 5, 10 degrees inside. I've sat in freezing rain in big sur for almost a week, it was cool, but I used real gear and didn't have to leave or bail because the gear actually worked. I have a 2 pound double wall tent I got just for such circumstances, when you compare the weight of that versus a full sized tarp, it's almost silly to not carry the extra weight.
I also suspect your neoprene socks absorbed water and basically froze your feet, that's why I don't do stream crossings in the footgear I will wear hiking, particularly not in winter in the cold. And if using neoprene for long stream walking, just take it off when you get to shore and put wool on. It doesn't take long to change shoes/socks, I've never understood the idea of just walking in streams in the dead of winter, but that might be because I was raised at an early age to respect cold climate. Having wet feet in the cold is a very very bad idea, despite what you might think people on bpl say, I never saw anyone out there in the winter when I went, just like you, and that's for a good reason.
But otherwise, don't take this as a reason to not do it again, just realize your gear was just basically fine summer/spring gear, not real winter stuff on the cold humid coast winter climate. The second you fully enclose your body in a shelter you start to warm the air in it almost immediately, so you don't have to waste energy warming your body as much.
Big sur taught me to treat stuff like cold, wet, and hypothermia more seriously, so I upgraded my gear to be able to handle it, overkill for summer/spring of course so I can use less in those seasons.
Awesome pics though, I've always wondered about some of those trails, but you were a bit lucky on your trip I hope you realize, when you get that close it's a strong warning to not mess around with summer gear in winter, and to make sure you have stuff that actually warms you when you need it, like synthetics etc.
In other words, about 2 to 3 pounds more gear would have made all the difference in the world.