Pretty good choices there. There are just the few general things that many people use to get the weight down.
Swap the 700 pot for either a MSR 850 kettle or 600 pot. take the lid off and replace with foil.
Swap the canister stove to an alcohol one. Gossamer gear sells good ones as well as http://www.minibulldesign.com
swap water treatment over to aquamira, safer and easier
swap spork for a plastic disposable one.
good choice on the umbrella I think. Sun and rain protection, though i dont see any lower leg protection. I don’t usually take it but a lot of people worry about that kind of thing.
For a synth bag try a ray way quilt. One layer of each thickness of fill should go down to 32 easily. http://www.rayjardine.com
I also notice your using a compression sack. This will cause your bag to lose loft and will not insulate as well.
breeze pack is good but you could get away with a pack less than half the weight like an GVP überlight, or a sew up a ray way pack kit.
just as a general wondering how do you pitch the tarp. I stand to save myself another 4oz if I use an MLD tarp. Are you using poles or debris found. Have you experienced heavy rain in this tarp yet? How was it?
I hope the comments help.
The bag change alone will get you into SUL. Lose the rest and you might join some of us in sub 4lb.

