Titanium allen key skewers will be less than 30 grams for $30 on ebay.
You seatpost clamp is around 27 grams ( I have the same), so you can shave 20 grams there really cheap.
Kalloy Uno stem will be 100 grammish for 35 dollars and can shave 50 grams.
Saddle is your personal choice. There are 90 gram saddles, specialized toupe shaped from China for 35 dollars. If you can be comfortable on them, can be a good weight save.
I wouldn't mix the groupset since you have all parts 7800, so I would go for lighter "link" housings and cable. They should be enough I guess.
Got my seatpost calmp(10g), UNO stem(99g), went with the quick release Titianium Skewers(42g)@$27.00. my old skewers where 106g, and old Stem was 155g.
My seat weighs in at 195g so I might look at other seats, but needs to be just as comfy or its a no go. Still looking at cranks, but that stuff is so confusing..
My question is what you mean by lighter "link" housing and cable? How mush $, and how much weight can be saved with those?
Thanks again for your guys input, I am well on my way to a <14lb bike.
I will post pics with weight soon...