Big Sur/Ventana is lovely in Winter. I'm assuming you have real rain gear, and that you are using a real tent, and that you have a sleeping bag/air mattress that is adequately warm, and that you are using layers that actually fit the climate/time of year, otherwise I'm somewhat mystified by your 'cold/damp' comments, I've done lots of winter backpacking in lower altitude Northern California, and neither cold nor damp are the first memories that come into mind, except when my gear was bad/worn out or otherwise insufficient. Point Reyes is really nice in winter too.
I'm also assuming you aren't following the advice to walk around with wet socks/feet because of not wanting to carry the few oz of weight a light pair of stream waders entails. Point Reyes has no streams to cross so that's not an issue there.
There's not a lot you can do about the length of day, maybe bring a decent headlamp and cook after dark sets, then read or something, I can't make any suggestions about how to spend the roughly 12 hours a day darkness, never bothered me much that I can remember. I personally like reading a very good book when backpacking, that's why I sprang for a good zebralight headlamp, all the better to read at night.
The high ridges in Ventana aren't going to be in the same climate zone as the lower redwood canyon/valleys, so that's something else to think about, you can access those either from Botcher's Gap, or by hiking past Sykes on the main pine ridge trail, or by driving in from the inland side, to China camp or thereabouts.
I'm actually itching to do these kinds of trips myself, all of the above would be nice at this time of year. Now that I think of it, a synthetic sleeping bag will help a bit if it's very damp / humid in the air, I haven't tried some of my new light gear in these settings yet, so can't say what works and what doesn't, regular weight gear is excellent in our winters though, that I know.
If there's wood and fire is allowed and safe, a campfire is another really nice way to spend a few hours at night, staring into the dancing flames, watching the embers shift and swirl... but I digress.