Steelskin/coc despair str stacker

Hi loving the build but im looking for ways to make it more beefy.
I still lack the timeless jewel needed but at 500div thats not happening anytime soon.(Lethal Pride Akoya 13572)

This is my build up sofar
https://pobb.in/sfPUucCalUVb

ive been following this one
https://pobb.in/H_AaPp0qZgUU

Now i do decent damage but i feel like i could replace purity with something else
its really only running for the def against shocked etc. i also have a watchers eye that gives me 75% chaos res i swap them if needed for the content

any feedback is welcome :D