RF Jugg - Uber Elder and Delve Gear question

Hey guys - not a new player but having some trouble finding calculations on what my best set up should be.

My character can be seen here RageFilledKoala 95 Jugg

https://www.pathofexile.com/account/view-profile/NateDiesel/characters

Paste Bin here

https://pastebin.com/uFTttfbM

My Question is I am looking to do Uber Elder here soon along with pushing delves and I have two Kaom's and Two Saff's shields.

Am I better off going with 4% life on both for roughly 9.2k life, or going with the 50 reduced Crit and 8% phys taken as fire dmg at 8.9k life. There is higher fire damage 35 vs 38. not sure how much that really matters.

I can't seem to find any calculations for it and am not noticing much difference while' mapping. Any help is appreciated.

Life or 50% less extra crit dmg? 35 vs 38% fire dmg.



Life or Phys as Fire Shield?

Phys as fire saffel should be a no brainer really for RF builds. As for Kaom's, I think it's mostly down to preference. I would go with crit one.