Dave,
Wow, looks really good! What are the typical weather conditions for you? Lows: 60's? Highs: 80's? The 5 items that could maybe be tweaked or replaced:
OR Celestial- (10oz.) Could you use a windshirt (3-4oz. vs. 10oz.) or even consider picking up a Driducks jacket in the event of rain? I'll assume you need the OR Celestial shell for those northeastern shower possibilities. Do you hike in the rain? If not just nix it and use a windshell and wait out showers under your tarp. I could see you saving 6-7oz. right there if you swap out the shell for a lighter option, the Celestial jacket seems a little too bomber for warm summer showers.
REI Long Sleeve top- 7.7oz. I don't know your expected lows where you hike or if you sleep cold or warm. But if the summer time lows don't dip below 60 just lose the REI long sleeve top and sleep with a shell on over your Synthetic T at night. I would think the Arc Edge conservatively rated @ 40F and your T-shirt paired with a rain/wind shell would be sufficient.
Snow Peak LiteMax- (6oz. = 1.9oz.+ 4oz. fuel canister) The 1.9oz. weight of the Litemax stove isn't bad at all, however the necessity of carrying the +4oz. full fuel canister is the only setback. A Caldera Cone setup for your MLD 850 pot would be lighter and depending on how MUCH you cook you wouldn't need more than 3 oz. of fuel (esbit or alcohol) for the 2 days. You could switch to a TiTri cone for your MLD 850 and not bring any fuel and use wood as well.
Leatherman Micra- (1.8 oz.) If this is all you have then it's what you have. The Micra isn't exactly overkill but could a single razor be sufficient for cutting open food packages, first aid dressing, etc.? I've never found the need for a nail file, screwdrivers, scissors and bottle opener out on the trail typically, especially a 2-day.
Platy hose (hands free)- (2.375 oz.) I have the Evernew bitevalve and tubing for my containers. Like you I enjoy the handsfree factor, however you could easily just reach back and grab a bottle out of your Burns side pockets. Since you've gone to great lengths already to cut weight and make a real streamlined summer kit you could just use a 1L Aquafina bottle or use 2 Gatorade bottles and lose the Platy hosing altogether.
Just some ideas. Great list. I really like your Burn and Arc Edge. Cheers.
Eugene