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I have even less armor than you, i solo many maps and i rarely die. And I highly recommend you to use mind jewels, at least on your main sets (i only use diamonds/natures on gold loot set).
I'd...

diamond jewels useless (too low armor), if you need armor - get it by awakes

Try a setup like I have, a defense loadout with the lv 81 staff, proc the staff and switch to your main damage loadout.
https://youtu.be/TzwnPQt44Ms
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