Thank you all for your suggestions. I had not really added up 6 outer layers, so I do appreciate the perspective.
To justify one of those layers, I have gotten in the habit of always changing clothes before going to bed, and will continue to do that; I find that putting on a clean dry layer allows me to sleep warmer at night. And weather permitting, I will probably drop the thermals. Only in the coldest weather do I hike in anything more than a short sleeve shirt, but always in long pants.
And I will also consider an insulated layer. I have a "light" Columbia Fleece, but it weighs some outrageous amount. Not to hijack my own thread, but can anyone recomend any other light-weight jackets? I have previously been satisified with a multiple light layers and have never taken a "heavier" jacket. Any additional ideas here are very welcome.
I will also look at the weather carefully and may take my lighter quilt.
As for the water storage, there will be 4 of us going, so if everyone takes 2 liters personally, and we share the 3 liter platty, that may be an option. I primarily take my cup for coffee, and I use my pot for water only (hence I never clean it). I am satisifed to rinse out my cup with water that I just drink. I used to use a single cup (REI clear thermal mug) for both measuring and coffee, but at almost 5 oz it was too heavy. I could drop the little measuring cup, but I am not good at estimating; I may look for a lighter measuring scoop.
The coozy I have is a homemade one with bubblewrap. It is slightly oversized, so that in a pinch, it can hold 2 FBC quart meals (if I am hiking with someone who does not have one). I may have to re-weigh this to verify.
As for the food can, it is a Folders plastic coffee can. I do like to keep my food organized, and this gives enough rigidity to protect my food when I am rough in the pack. It holds 2.5 days of food perfectly. I might be able to substitute a similar sized silnylon bag I have to save a little more.
All good ideas. When I plug these changes into my gear weight calculator, it gets down to about an ounce under 12 lbs, without food, water and fuel. That is nice! With estimated consumables, I am right at 17 lbs for this hike.
Additonal ideas on a light insulated layer (jacket) are welcome.