Sounds like you have some fun in front of you.
I would toss the Thermarest or get a lighter foam pad something like the Gossamer Gear Thinlight, save you 4 to 8 ounces. The wind proof fleeces are nice when sitting still but the lack of breathability will be bad when moving. I would swap it out for a Patagonia R2 type fleece, probably about 4 ounces lighter and a lot more breathable. And if it is so cold even when you are moving wear your Regatta over the top.
The weight of your pack is the killer part. eBay has old Jams sometimes, or any of the Dyneema packs would work. I have a Cold Cold World pack made for me out of Dyneema at a little over 2 1/2 pounds, at around 3000 cubic inches. You could easily save 3 pounds there.
Ponchos are nice but when moving over Class 3 terrain, typically average of what I like, I want to be able to see my feet, and do not want to be moving wind blown fabric from cutting down on my vision.
In summertime I will wear my Patagonia Jackalope pants, silkweight longsleeve, R2 fleece, Houdini, and if it gets really bad on goes my Spraymaster.
I agree with you about the free standing tent. I have been in some storms where the thought of a tarp scares me, but that may be my lack of experience with them.
I also carry 2 1 liter Platypus bottles and a 2 liter Platypus. I would be nervous if I only had one water source. You may want to consider some sort of backup water bottle. The altitude usually hits me hard so I drink like a fish. I will start out with 4 liters and have the first 2 liters down in an hour to get a good level of hydration going. I will carry a minimum of 2 mini Bic lighters maybe even 3.
I have had good luck with a soft shell glove, particularly the OR Vert glove, Schoeller with leather palms. While the gloves may not be as warm as fleece glove, in the wind or putting your hands on rock they will be more durable and weatherproof.
I would toss the long underwear top and wear the Craft shirt to bed, if that what the thermals are for, a few more ounces there.
I don't take a ski mask in the summer. If the wind is blowing hard enough, or cold enough, I will bury my face in my shell jacket or you could use the long underwear bottoms or something like that.