Ok, my question is where do you want to be? Do you want to be at a UL weight? Do you just want to lighten up and stay in the Lightweight category? Neither answer is wrong, it's a personal preference and would help guide me on helping you cut stuff out.
First and foremost after every trip sort every thing into 3 piles. Didn't use, barely used, and used consistently. These piles will guide you to slowly cutting the small excess. If it's not safety equipment/first aid and it made it in the didn't use it pile, toss it out of your pack and delete it from your list. In the barely used column see if you can shrink the packaging to lighten the gear up, or evaluate whether it was really needed and toss it. Start keeping a record of how many layers you really use at what temps, that really helped thin out my layers. Excel is your best friend with gear lists and keeping track of weights.
But looking at your list, another rule of thumb I use is that my stove needs to be lighter than the cook pot. If you are only using a 600ml mug do you really need the canister stove? The empty canister alone is upwards of 3oz. You should look into a BPL or Tibetan Titanium Esbit wing stove (~.5 oz) or an alcohol stove for 3 season use. An esbit tablet weighs .5oz in packaging and one tablet in a wing stove with a .005 Ti windscreen will boil 2 cups of water for dinner with 3/4 of a tablet. The last 1/4 of a tab could be used for warming water for coffee or tea in the morning and that alone would save an a lot of weight, especially on longer trips.
Cut the 2nd mug, there's no sense in carrying 2 mugs. Just use the Snowpeak for your cookpot and also use it for you morning coffee or afternoon tea. If you actually are trying to cook in a 600ml mug look into freezer bag cooking.
You can cut your filter weight in half or more by getting an aquamira frontier pro filter and making a gravity filter with it, and coupling it with Micropur tablets. Personally I just use Micropur by itself, .25 oz for 10L purified.
Why do you have 2 shells? or am I reading that wrong. Remove all redundancy, Why carry extra pants? Just carry the clothes you are wearing, an extra pair of socks, boxers and actual insulation layers...
I'd look into a smaller pack than the catalyst, say an ohm or a catalyst if you are going with ULA, also check out moutain laurel design's packs as well if you start looking at frameless UL packs.
Also look at lighter shelters like the moment, or a tarp and bug bivy.
As for the sleeping pad, if you need a big thick and comfy one, look into the Neoair small mattresses. They are very comfortable and only about 9 oz.
Your Big 3 (shelter system, sleep system and pack) could be greatly reduced in weight...
Start with the cheap stuff like removing redundancy, than hash away at your big 3, there is pounds of savings to be had there alone.
Gear list ideas, you can comb over my gear lists if it will help you. I live in Washington so I'm used to the cold and wet.
a Couple Gear lists