When I started trimming weight from my old setup, I found out it gets expensive PDQ.
After farting around forever with a spreadsheet, I finally just set my goals as such. You might want to consider the same and start making changes bit by bit.
3 season big four = 6#. This is where to start. Buy your pack last.
Everything else 6#.
12# total 3 season base weight goal.
Add 2# for winter for a 14# winter base weight
For 3 season your sleeping bag should weigh about 2# for a 20dF bag, pad 1# or preferably less, Pack 1.5# and tent 1.5# for a single person tent. Of course you can swing weights around, IE a golite ultra 20 at 20oz would leave more room for a heavier tent, bivy etc. or just a lighter setup. By sticking to that fairly closely you will keep from buying Eq that is too heavy to hit that desired base weight.
Options are Campmor 20dF down bag or a quilt, Neoair or other decent R Value pad under 1#. GG Mariposa or similar pack depeding. GG the one or a gatewood cape and bug tent or tarptent subsil, or tarptent moment are all decent.
If you are a hammock hanger your base weight might go up a bit, like a pound or two.
For the additional 6# of base equipment you really have to sort and weigh everything to the nth degree and get rid of the excess stuff. Bag cookset, alcohol or wood for 4-5oz, chemical water or super light gravity filter, doblue use as much as possible, and everything else light light light.
+- 2 oz med kit, 2-3 oz emer kit, everyday stuff, 9-10 oz for everything.
You can MYOG some of this stuff, but I would suggest spending decent $ on your big 4, base layer and insul layer. Driducks as mentioned above are cheap and dual purpose, as long as you dont do any heavy bush whacking.
I am after a montbell thermawrap parka right now.