Pack is a little heavy: test for comfort without aluminum stays using sit pad instead?

A 3/4 length blue CCF pad would save you about 14 oz. It works fine for me as a stomach sleeper.

I wear light dress or non-cotton athletic socks in the summer.

How heavy is your cook pot? You could use a coffee can for that also.

How are you purifying water?

I'd add a spare lighter, matches, and Micropur tablets to the Altoids tin.

Can you actually cut wood with the saw? (small wire ones are notoriously inefficient and fragile)

Keeping at least a whistle, knife, light, compass, and map on your person rather than in the pack is a good practice in case you accidentally or purposely ditch it.