Need help optimizing cws chieftain

Hello. I am playing a low lvl budget version of emiracle’s cws chieftain on console.
I just manager to get a defiance of destiny. And have 10 div budget left.
I’m not using clusters atm and still on a rise of the Phoenix shield.
I need to get jewels with max fire res in order to upgrade to a prism guardian or rare shield.
These are pretty much non existent on console. Or out of my current budget.
I can run ultimatums on T16. I die in 17’s tho.
I would really appreciate some pointers or suggesties to upgrade my build or my farming tactics.
Most inscribed ultimatums i find are very low lvl. Like 10 - 20 chaos reward.

Ps… I don’t know how to post my charaxter here