After testing this out on a dayhike yesterday, I'm switching the Ibex Echo T to a Smartwool Midweight LS (normally I hate hiking in long sleeves, even in winter, but this didn't feel too bad yesterday).
Also adding the White Sierra fleece shirt (8 oz). I'll probably add a cut down blue-foam pad that I have sitting around the house.
I'll drop the polycryo ground cloth, taking only the bivy. Also dropping the sunscreen (plenty of skin cover).
I won't add a cell charger-- it will only be on from time to time when I'm in towns in order to arrange shuttles, places to stay, etc. If I was in the habit of checking in with someone every night on the trail, I think I'd leave the phone at home to avoid that possibility.
This should put me around 11 lbs base weight, which is slightly more than the 10 lbs I was shooting for, but I can imagine much worse things in life than an extra pound. I can always drop a little extra weight during the trip.