Some things seem like super overkill for a 24 hr trip, I don't think I've understood the itinerary. You are carrying a full sleeping/shelter set-up because you need to sleep at the very end? How far is the end of the hike from the nearest trailhead? You have to have someone picking you up anyhow I would assume. Either way, I would personally be fine nixing the quilt. Especially with the 8oz (!) baselayer, t-shirt, fleece combo. If you absolutely must bring the quilt, at least ditch the baselayer.
The bag seems massive for your needs, have a smaller daypack? A too-large pack bashing around for 45 miles would drive me nuts.
do you need a bladder and a platy? is it that dry out? Also, if you are moving fast and using aqua-mira, I would suggest a couple of recycled spring water bottles for ease of access/ease of filling, also saving a couple oz.
Do you need a groundsheet for one (almost) night out? Don't get me wrong, that bivy sounds expensive.
First aid kit- 4oz. If this is mostly foot care stuff, ok. If not, what is in it?
Firesteel- Carry a mini bic and some vaselene soaked cottonballs/an esbit tab for a no-brainer fire at zero weight penalty.
If you are buying a brand new petzl, and you make sure it works, carrying a "backup" light seems like overkill for one night, and certainly so if you are hiking with a partner or two.
I don't know if you have done this sort of thing before, but you put "going to buy" for the boxers, and I wouldn't hike that kind of mileage in brand new undies.