From an outsider looking in (my longest hike is 3 days), 2 questions come to mind.

1 - Does the Exos have a sleeping bag compartment? If so, I would imagine you could lose the stuff sack for the bag - wouldn't this also help preserve the loft of your bag?

2 - How does your Platy 2L weight less than your Platy 1L? Is that a typo?

Being that I am king of the spreadsheet, I recently calculated individual weights as you have here and identified several areas to drop weight. Being that my base pack weight is in the 30's and I aspire to get it down into the 20's (including water and food) I still have some work to do...<sheepish grin> I might just have to cheat a little off of your list.

Good luck on your trek!