If you arent tired of BV occultist yet, this build will probably destroy any delve content. You have 3 curses + grace + some spell supression + regen/recoup as a base defense. EB takes care of any mana concerns. You get something like 15% of life on kill which in delve happens all the time. you destroy all corpses and jumping spiders should be insta gibbed as long as BV is up. DPS can scale very easily on no items. If you wanna go fast other movement skills are an option and plage bearer lets you dash through all content https://pastebin.com/duDAmra6 i would be running this if i hadnt played BV to death. To clear any zone pretty much hold the skill button down.

Edit: Thinking about it some more, should probably have despair on CWDT and enfeeble temp chains on blasphemy for more defense

Edit2: I suppose if you really wanted to you could spend 4-5 points on dagger or claw mastery for either perma culling or denying all crits by enemies, would be a very defensive layer

Edit3: I would start with claw and shield, seems busted

Edit4: last edit made it to 90 on day 2 like depth 180 or something, made some changes easier just to link my character https://www.pathofexile.com/account/view-profile/PathOfExLie/characters