Help Needed: Improve Defence of My Lightning Deadeye

Currently, my Lightning Deadeye has good enough offence in terms of map and boss clearing. But for certain types of bosses, it struggles a lot with 1 shot kill. I know physical defence is a not a strong suit for this build, but wondering if the spell suppression and evasion currently also too weak to sustain higher level maps? (Currently Oki-ish for level 10 maps, from level 11, feels sometimes, it gets a bit vulnerable. And very stressful on merciful and uber lab boss, but that might just be the boss mech there, so I've heard?)

What should I be looking to improve to increase sustainability?

https://www.pathofexile.com/account/sony/view-profile/miracleyoo1/characters?characterName=PythonJS