Good list, and great responses so far. Note that I didn't review the list for completeness --- you need to do that, against other lists that suggest that they're really "complete". So for example, if I notice that you don't list a trowel or the like for digging a hole --- that's on you.
Repackaging A.M. drops is a PITA I think; I did so some years ago (after seeing it suggested on this site) and might be good for a short trip where you're really watching the weight, but for a thru-hike --- just take the original containers. You go through the stuff too fast to mess with tiny bottles and bouncing it all the time. For my part I'd generally rather have a nice buffer as I've run low and even out a time or two.
Agreed that you want hand warmth beyond mitten shells. In fact, I might save those shells for WA state only. I suggest thin liner gloves (G.I. polypro can be had cheaply online) and then a thicker MITTEN. Apart from in a liner role, gloves SUCK. If they're thick enough to be warm, the fingers are so thick you can't use them much anyway. OR PL 400 Mitts are a good choice. Add a pair of bread bags if you want a shell, as you'll almost never want them until maybe WA state. In fact, add two pairs, unless you really do switch to boots in the sierras; I suggest that you stick to shoes and add a second pair of bread bags to wear them in camp when wet (with dry socks).
In fact I suggest that you drop multiple things until WA state: kilt, pack cover, and maybe pack liner (perhaps a really thin, short durability one that you'll rarely use).
Agreed on the above about wind shirt, though perhaps your rain coat layer can serve double duty there. Cap 4 strikes me as heavy as a "mid" layer. Generally all I wanted was a windshirt over a thin base layer, unless stopped, in which case you can add the down jacket.
Tights: drop 'em (even in WA state). Or at least that's my suggestion.
Ditto above on the cord. Carry some, but paracord is heavy/bulky. This, at least, is something that's not too hard to change along the way.
Go to the kickoff if you can; a good time to get a last-minute shakedown of your gear if you like and talk to a lot of people about alternatives. Lots of people end up mailing a lot of stuff home from the K.O.; I doubt that you'll be one of them, overall this looks pretty dialed-in to me.