Matthew, I will be dropping the R1 hoody, as long as the lows are above 25F or so. I don't think I can drop the Capilene, though. I spent a night really cold at 28 degrees with my Golite Ultra 20, silk weight base layers, nice socks, Montbell Down UL jacket, and my 3/4 Prolite Plus. I didn't have the GG thinlight that night, however. I just think the upgrade from silkweight to cap 3 is necessary for me and my optimistically rated quilt.
I am switching the knife for a much lighter straight blade, and I am going to cut down my first aid to basically some moleskin and some benadryl. Can't drop the maps, well, not maps-but 3-4 pages from an AT data book. Bear line is a necessity too, would hate to lose my food to mice or bears. But since you don't hang your food, do you just leave it on the ground? In your tent?
And about the pants, living in Florida, I don't do much cool weather hiking. But I suppose I'd be fine just wearing the running shorts while moving and I can throw on the Golite Reeds during breaks if it's chilly and wear the Cap 3s around camp. Sound feasible?
By summer I plan to have a Kookbay pad, a 7x9 cat cut tarp from Z-Packs and a meteor-style bivy. Those plus a groundsheet and stakes should come in at about 16oz, saving me 14oz on my shelter and 2-3oz on my sleeping pad. After factoring those in and dropping my colder weather clothing I have a summer base weight of 122oz or 7.6lbs and a 3-season weight of 8.9lbs.
Gonna be rad. Even though the weight savings will be about a days worth of food or a liter of water, I think I'll really enjoy the flexibility of a tarp/bivy combo.