PoE neq builds

I was looking into a way of building smite this league since Vaal Smite looks like it could be fun I've been thinking a bit of how to scale smite and came up with the following: Core mechanics : Aura stacking-lite champ for armor/evasion stacking Perseverance shenanigans Convert all of Smite's lightning damage to cold damage via double Call of the Brotherhood Capitalize on Heatshiver to add 130% of that cold damage as extra fire damage top it off with Paradoxica to make any added flat lightning damage doueble dip and then into cold and then fire as we

this guy is fairly tanky, but it doesnt feel THAT tanky. im not sure i'm understanding some of the math in PoB and why it thinks the effective hit pool is that high? (i only have like 4.5k eHP) I would also of course like tips to take that existing HP even further if you got em.