On this trip, keep track of what you use, don't use, and could have not used. Carry those pounds of water if you want, but consider if you could have just topped off your stomach and gotten by with a only a pint or a quart. See how little of your cook kit you can get by with. Try to avoid using all but one utensil, etc. Consider if a smaller knife would have done everything you asked of it. Whatever comes back unused gets left behind next time. That's how anyone gets to be UL – in steps, over time, and with greater experience. Experience, knowledge, confidence, and creativity weigh nothing AND allow you to do more with less.
Most of my first aid kit is in my head. But I taught standard and wilderness first aid to a few thousand people and have rendered a wide variety of aid on the trail. For bandages and splints: Either it's minor or it's serious. If it is serious bleeding or broken bones, any cloth is a dressing. Any branch, sleeping pad, or pack stay is a splint. And while we all love to be independent, really, if you're hiking on trails, there are lots of other BPers, almost all them heavy-weight BPers. Anyone is going to happy to finally have a use for their first aid kit if you need something. But there aren't trauma dressings or splints or c-collars in anyone's 2.3 pound first-aid kit so for serious problems, you'll be MacGyvering something anyway.
I'll bump some of my gear a little bit for first-aid reasons. For instance, I'll take a 36×36" silk bandana instead of a 30×30" cotton one. It weighs the same, but the larger one is much more versatile as an arm sling, tie-off for a splint as well as being a wash rag, cool wet cloth on my neck, snot rag, and foreign-legion-style-under-the-hat sun guard. $12 or so when STP has them.
My first aid kit: 2 or 3 bandaids for little nicks, a small pill bottle with 2 or 3 each of Benadryl, aspirin, NSAID of choice, and Imodium – having reviewed and memorized when/how to use each of those. Plus a 2 square inches each of moleskin and mole foam if someone along has shoes they can't trust completely. Everything else "in my first aid kit" is some other aspect of my gear (SAK Classic for blade, scissors and tweezers), needle in my repair kit, etc.
Edited to add: I followed the link for the OPs first aid kit. Too many bandages as always, but I actually liked the selection and quantities of drugs. I'd keep all of these, maybe repackaging them.
2 Antihistamine (Diphenhydramine 25 mg)
2 Aspirin (325 mg), Pkg./2
2 Diamode (Loperamide HCI 2 mg), Pkg./1
3 Ibuprofen (200 mg), Pkg./2
3 Triple Antibiotic Ointment, Single Use
Xerox the instruction pages about the drugs (or they'll do you no good) and read them until you're learned them. Then use those pages for fire starter or toilet paper.