Here are my suggestions:
First off let me say that I was always a big fan of one piece leather boots (although I never liked GT boots), but finally tried trail runners about two years ago and haven’t worn my boots since. I also tore three ligaments in my ankle(not backpacking) about 3 years ago, and haven’t noticed a lack of support from trail runners.
Secondly, your tent; Selling your tent and buying a tarp or other lighter shelter is an option as mentioned by a previous poster, but for a double wall tent, that is pretty light, so you might want to keep it. I would ditch the footprint though and save your self 4.5oz. I used a Big Agnes Seedhouse SL1 for well over 100 nights with no footprint and never had a problem with the floor. I since have gone to a Gossamer Gear SpinnShelter and Alpinte Bug Tent.
Personally, I think your sleeping bag and pad are fine. I am not saying that there are not lighter alternatives, but those are both pretty light options.
I would ditch the bag liner and save 4.4oz. I always carry clean clothes to sleep in (Capaline 1 top and bottoms, socks) so that keeps my bag from getting dirty, and I don’t get tangled in a bag liner either. I also wear the clothes once I get to camp but before I go to sleep so they are sort of duel use (camp and sleep).
You might consider selling your pack and getting a Gossamer Gear Mariposa Plus, ULA Ohm, or similar. You could probably sell your current pack for what you could pick up a lightly used UL pack for.
I agree with the above poster about that stuff sack seeming too small. I prefer oversized stuff sacks for sleeping bags allowing them to take up more space in my pack as food space is decreased.
I would (when money allows) sell the mug and the .9L pot and get a smaller pot/mug combo (assuming this is for solo use, and mainly boiling water) like the BPL Firelite 550.
Although you won’t save much if any weight on longer trips, on short trips an alcohol stove might be something to think about. The problem with a canister stove even the smallest canister weighs 7.3 ounces with fuel.
I may get flamed for this, but I would drop the firestarting kit. I might add another bic or book of paper matches as a back up to your current bic.
Why don’t you drop one of the two lights? That is total overkill.
2.4oz for a knife is overkill. I have a nice Spyderco Ladybug that is more knife than I will ever need at 0.6oz.
You might try using a trekking pole or shoe heel to dig a hole next time, I have found that I don’t need a trowel.
I would replace that heavy Big Zip platy with a Gatorade bottle or Platty bottle. That is way too heavy for what it is. Personally, I like hard sided Gatorade bottles myself.
I carried the Pur Hiker filter for years, but went to Aquamira drops years ago and haven’t looked back. There have only been a few water sources that I have been too where I wished I had something more. I found the drops to have less taste than the tablets and they are cheaper, but the tablets are lighter and easier than my 1oz repackaged Aquamira drops.
Why are you carrying extra batteries? Change batteries before you leave on a trip so you don’t have to carry spares. You should also be able to find AAA’s at most resupply points for longer trips.