Don't you think you should split your 3 season list into 2 or 3:
Spring: lot's of deep wet snow on most trails, long days, cool temps
Summer: little snow cover, hot temps, thunderstorms
Fall: some fresh snow possible, cool temps, short days
These require some changes in insulation, lighting and especcialy footwear choices, that I don't see happening in one list.
Indeed, Backcountry.com had their Ti kettle on sale, but at 3.9 oz that doesn't save any weight. Replace the lid wit a foil one and it should be a tiny bit lighter.
Shirts: take only one shirt: if it's going to be hot all weekend, take the shortsleeve, any other time take a thin longsleeve zipneck. If it's warm, roll up the sleeves and unzip the front.
If you wear synthetic hiking socks you should wash them every night, but they will be dry enough to wear by morning, so ditch the second pair. For shoulder seasons see articles on BPL.
Bandana or Buff: take just a plain, non fleece buff for summer.
No rain pants? In summer, ok, but in spring and fall in the mountains?
No bra or underpants?
In shoulder seasons you could get a lot more warmth for very little weight by swapping you silk long underpants for Down pants.
In fall, a Photon freedom seems rather insufficient for long evenings and possible some night hiking(by accident)