Good start! Here are some initial thoughts.
While it's comfortable, there are much lighter packs. If you like Granite Gear packs, a Vapor Trail could cut out over a pound and a half and can handle the weight you have in total comfort. I'm not sure if you've used the Meridian yet, but you may want to consider exchanging it. It should also sell easily.
I would loose the compression sack for the sleeping bag. S2S Ultra-Sil dry bag is only an ounce. Non dry-bags are even lighter. You don't want to over compress your bag too much.
BA Pad is nice, and I didn't give mine up until the NeoAir came out. That said, there are lighter options. NeoAir cuts 10 ounces from your pack, but also $150 from your wallet.
I don't think you really need a ground sheet unless you are on rocky desert soil. A clear poly drop cloth is much lighter if you feel you need one.
You could probably trim an ounce or two out of your first aid kit pretty easily.
Don't need a trowel. Tent stake + shoe heel = hole.
I'll leave the TP discussion to Mike C. I bring TP. :)
I got a hand sanitizer squirt bottle at REI that's .75 ounces. Deet could be lighter too. Together, those are 1/3 pound.
I'm sure you love it, but I would replace the Jet Boil. Alcohol, regular canister (giga power), BushBuddy, and Esbit are all much lighter. One pound for a stove and pot is a lot. For example, an alcohol stove, windscreen, and snow peak 700 can be as little as only 4.5 ounces and works great, and you could ditch your Titan Cup and save 2 more ounces. Just something I would look at.
I would loose the Nalgene bottle. 1L Aquafina is only 1.5 ounces and works great for all the same stuff except boiling water.
You really shouldn't need long johns at those temps.