"he is running with them so they are mostly hitting him by range attacks like death strikes."
No. you mostly kite asuras at 220-280. at 280+ if you want to get a better xp you run and then semi-box (wall-box).
You can see this in this video:
"With my set he would stay with 4 % physical, 31 % fire, 19 % death vs 14% physical 17% fire 18% death 2 more distance levels."
Well, even if you kite the most damage you will take is still physical. (i hunt asura palace since lvl 230, i'm now 320).
Also, as you mentioned, my set gives more distance. (+ leech)
"As I said he will run with monsters so he will get mostly range attacks. I guess you are wrong :>"
I think you should try hunting there and using the damage analiser. anyone that sugest fire imbue over death imbue prob never hunted there checking the analiser.