My shoulder season kit…

20 ounces for your rain gear is a place where you could lighten up a little. How about a driducks jacket instead of the Precip?

You could go with a large tarp (your height + 3 feet square) a la Ray Jardine and not use a bivy. That size of tarp would allow you to be protected from spray, and you could pitch the tarp edges to the ground to protect against wind. That said, The Lunar Solo is a great-looking shelter, although I have no personal experience with it. It is also bugproof, and that would

As for bags with a tarp, you could go with a synthetic quilt a la MLD XP quilt that would not have any seams on the outer shell surface – this decreases the amount of spots water can get in.

"20 ounces for your rain gear is a place where you could lighten up a little. How about a Driducks jacket instead of the Precip?"

I do mostly desert hiking, and a good bit of off trail. I am concerned about the durability. Are Reed pants tough enough to survive prickly, sharp, nasty desert plants? What are bush whacking rated wind/rain jackets?

"You could go with a large tarp (your height + 3 feet square) a la Ray Jardine and not use a bivy. That size of tarp would allow you to be protected from spray, and you could pitch the tarp edges to the ground to protect against wind."

I have no experience with tarps, Would something beaked, a la MLD Patrol, work? They are real light.

An MLD Patrol Shelter would give you good protection and would be an excellent choice without going completely to a tarp. I went with the Grace Solo tarp in Spectralite and it has worked out well for me when I went from TarpTent to tarp for my primary shelter.

Michael,
Looks to me like a solid list – and that you are at a point where spending money on lighter gear will provide lower and lower weight savings (we've all been there).

But…
5.6 oz. bathroom kit?
3.4 oz. Aqua Mira (can you repackage this, seems like a lot?)
3.4 Tikka XP (I have one but use it only for extended night trips or winter weather – IMO, overkill for most – but you already have it, so is it worth replacing for a few ounces?)
2.4 Batteries (Spares for the headlamp?)

Shelter, if you don't mind floorless, the MLD Duomid in Silnylon is ~165 and 15 oz or so. Sized for 2 people and full coverage so no need for a bivy.

just my $.02