PoE Cold, Duration builds similar to Bossing with LS Champ - Sub 50 sec UA, Maven, Sirus

I started the league off with Aer0 cobra lash build and I'm barely in to maps but it is feeling just really awful. Mapping is just really painful. Cannot even attempt Affliction stuff because especially my single-target is abysmal. I know I'm missing uber lab and only have 4 link and shit gear etc. but I've played enough of this game I know something is seriously wrong and getting a few small upgrades is not gonna cut it. I am literally killing some regular rares for a minute or something if they are any tankier. Also if they do a

Actually played this as Lightning Arrow for the majority of the league. I saw another post on this subreddit using Heatshiver + Immortal Flesh and thought to myself wait, that's like 10x better than Voll's + random Stygian. Went from something like 100m LA + Artillery Ballista DPS to I think 140m, due to heatshiver. Interested in taking the build further, if anyone would like to take a look at my POB and point out any mistakes/gearing upgrades I can make. Kind of unsure how much the 50% inc effect of ailments mastery is helping me, for example.

PoB: This build uses Kinetic Blast to Cast on Crit Dark Pact + Chain. I threw this together since I got a minion life relic and always collect CoC poison gear for fun to try stuff. The idea is that KB might sometimes look like a real CoC skill if you chain it off a Tornado. We create Tornadoes and skeletons using Poet's Pen. This build slapped way harder than I expected when I equipped it, so I thought I'd share. I'm wearing literal random gear. The core of the build can be considered poet's pen + watcher's eye + rings.

POB for the character being showcased: ~~POB for a general guide including leveling:~~ ~~ Updated guide with personal findings: Leveling was done using Rain of Arrows + Artillery Ballista. You can start using manaforge as early as level 8, but I wouldn't rely on it for damage until mana problems are solved with a Thief's Torment (minimum level 30). Early lifetap is NOT recommended. You can still use Frenzy