Just this year I switched over to a JRB Sierra Snievler.
I am 5'6" and 145 lbs....cold sleeper...also hike the Sierras like you.
I looked at the Hudson River, but if memory serves me correctly, the Sierra is wider than the 48" of the regular quilts they make.
48" is barely cutting it in my opinion and I am a dead back sleeper that does not move an inch while sleeping.
The Sierra was made specifically with the "ground sleeper" in mind.
Just over Thanksgiving, I was in Iowa, and I slept outside in 22F and 17F weather with the JRB quilt, MLD bivy, GG thinlight and torso pad...wearing all of my regular three season clothing. (Thermawarp jacket, BPL merino long johns, BPL Hoody, gloves, hiking pants, Primalid Insulated hat, hiking socks)
The 25F rating seems true to me....my feet got cold at 22F.
Adding ID Hot Socks and Montbell Thermawrap pants, I was able to stay out 4 hr til 4:45am, and my feet got cold and my back was getting chilled.
Anyway, my point is...look for something a little wider....especially if you are a side sleeper.
The Nanutak quilts are even wider, which would be ideal in my opinion, but the price of entry to play that game was a bit high for me...especially as I had never used a quilt before.
I love the quilt, but I can tell you that it is all about tucking the edges under your pad or your body to keep the draft out.
I did have to change my sleeping method from draping my jacket over my chest to wearing it....my shoulders were getting cold at the top of the quilt really does not have a good way to seal off at the top.
Wish there was a snap like the Golite Quilts or something to help keep the top of the quilt around my neck or to simply close off the top area to prevent drafts.
Maybe this is worth looking at:
Hope this helps and good luck to you....let us know what you decide.