You are starting kind of late, about a month behind most so you must be planning high mileage, you only have 5 mos and 1 wk if start NOBO unless you flip flop.
The hexamid + inner net is about same wt as the one with attached net, and the inner could be used in shelters to keep mices and bugs off of you if you dont like them.
get rid of tyvek ground sheet.
Id carry a lot more ibuprofen/tylenol than 2g. Also some immodium. If you dont need it, someone you are walking with will.
Hand sanitizer and soap? without this triple the immodium.
Hydropel? Ever hiked a week straight in the rain? You will. You are sure you dont need rain pants? Even 40F on top of Mt Washington , 70 mph winds, in a storm, you can do without? What will you wear while doing laundry if you dont have rainpants?
Driducks are great for short hikes. Id consider something more durable for 5mos. Only ~2 ounces more for OR helium or such. You will likely destroy the driducks top quickly.
add a 2L platy.
Allow yourself some luxuries, it will be worth the small wt addition.
baking soda instead of toothpaste. Lighter and multi purpose and no smell. 101 uses from poison ivy, to monkey butt. Also cures cancer.
wind screen and lid wt seems low
lighter long johns
tincture of benzoin ampule and more blister supplies beside duct tape, at least for first several weeks if your feet arent already accustomed.
dont need dry sacks, just get some cuben stuff sacks from hmg, much lighter if you need the storage organization
cardboard sign for hitchhiking (thru-hiker to town)
pen to write in registers
you will need some money, not everyone takes VISA. Yes it has weight.
bug repellent. Lyme disease is not rampant,but its not exactly rare either. Its pretty common for thru hikers.
food bag/bear bag and rope and carabiner
you need a good head net you can hike in. Google "black flies" and new england
consider some spare clean clothes, at least a Tshirt/underwear. cant always do laundry before you go eat with people in town. will make life more enjoyable,esp when you are soaked at the end of a long day, you have something nice and dry to sleep in.
Sunglasses? They dont call it the green tunnel for nothing, but there are times when you will want them too.
A separate bandana for cooking from the one you wrap around your head will be probably be wanted.
very small pad of paper. You will want to write notes, exchange addresses and such, write down directions to places for yourself or for others, or phone #s.
You might even consider journal so you can remember the trip. It can be done on a smartphone, but its a PITA by comparison