Help me decrease my base weight and advice on gear!

Ditch the sleep liner. If your quilt isn't rated to the temps you expect to face then you are better with a different quilt, a liner isn't going to make the difference. If your goal is to keep your quilt clean, my preference would be to go ahead and let it get dirty and wash it at home rather than carry the extra quarter pound.

You could find a lighter pillow solution, maybe a stuff sack with your down puffy inside.

The HMG pack is cuben so should be waterproof, no? So ditch the pack liner. Or, use a lighter oven turkey bag to waterproof only what you need to.

Ziploc instead of a ditty bag.

If you're eating dehydrated meals you don't need a 3 oz stove and a 6+ oz cook kit. And not only that, you aren't including the weight of your fuel canister (the fuel is in the consumables category but technically the canister itself is not). Get an alky stove and a super-light pot for water boil only. I use the Trail Designs Keg-F with a Starlyte stove.

You don't need two insulation wraps for keeping food warm/rehydrating.

6+ oz for a reservoir seems heavy, instead filter water into a repurposed water bottle with a squirt top that fits in your pack's side pocket or you can strap to the front of a shoulder strap (you definitely want it accessible).

I think you could get a new down hoody and shave several ounces.

Headlamp - I use a little flashlight that clips on the bill of my ball cap and weighs less than an ounce.

Your list seems to be missing some things. No extra socks? No gloves? If it's cold enough to bring a down hoody you probably want something on your hands. What about a map? Compass? Lighter or fire starter? Stakes and guyline? Knife or scissors? Your electronics category is missing at least one item -- what are you listening to on your headphones and what are you recharging with the power bank?

In your revised gear list you list Exofficio Underwear twice. A mistake?

I generally agree about three of anything, but I do give myself the luxury of two pair of sturdy wool hiking socks, PLUS a lighter pair of wool socks that I wear in camp. That way, my hiking socks typically have a day and a half to dry/breathe before they are used again. I can put up with a lot of misery if I have dry socks, so I consider a couple ozs for a third pair worth it.

But otherwise, yes: two pair of underwear, etc. I subscribe to the camp clothes and hiking clothes philosophy. I change underwear, socks, and shirt ASAP after making camp. Camp clothes stay reasonably clean because I don't sweat (much) in them.

(Aside: this also solves the sleeping bag liner issue: because I sleep in my camp clothes, usually including long johns, my quilt stays clean.)

I agree with cweston, though I don't consider my sleeping socks a "third pair of socks." They're a completely different item--light, loose, fluffy, useless inside a boot.

I'm with JRin on ziplocks and down hoody. You can surely find a down hoody of decent weight that is as warm and cozy as the heavy ones.