When you start on the light weight journey, I agree with the dry gear, wet gear idea. You then need to decide if your dry gear can tolerate some wet at all.... think emergency.... when you are parred down to just two sets of clothing. Can you get away with pure down for warmth and weight or are you beter to trade off a bit for synthetics, that can still work when wetted or at least will dry out to be of use on the trip.
Mostly food stays at 1 Kg per day however you take it.
Can you do two sleeping bags not just one bulky job. Can you use a lightweight booster bag, that does duty as a summer bag too.
A merino / thermal base layer can be your sleep wear and hut wear too.
Options have never been greater than they are today, try to make every choice of gear do double duty or at least fill a redundancy.
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