Like Balz, I'm not ultralight, so you already carry less than me. You seem to have stuff pretty dialed in. It is mostly nitpicking at this point.

I don't see something to dig a cathole. Do you plan to use tent stakes that are included with your shelter? If so, do you have an extra one for when your shelter is set up?

You have a few back-ups. You can play the what-if game. What if you didn't have it how bad would it be? For example: how often have you had trouble with your filter? How dangerous is drinking untreated water in the area you are going to? or.. Can you boil water if your filter failed? Example 2: What would happen if your headlamp went out and you didn't have batteries? Could you just go to bed early and wake up late?

I personally gave up on waterproof matches and bring a second bic mini. And as mentioned above, the Altoids tin looks cool, but doesn't much functionality. A Ziploc snack bag is better.