Help with transitioning defensive shell out of immortal flesh

PoB: https://pobb.in/QQNhJz3tXUFl

So I have this Blade blast of unloading character, and it feels really good to play due to the giga cast speed, but the fourth vow/immortal flesh setup has been kinda underwhelming defensively, and I wanted to free up my historic jewel to use a "From below" reclaimed malevolence instead of eldritch battery for mana (I already have the jewel). This would also allow me to fit in RF of arcane devotion for cast speed, which possibly frees up some gear pressure? Also I think entropic devastation is the way to go in the gloves slot, but I think I would need to get a delve ring with % phys leech to replace the implicit.

Any ideas? Melding of the flesh? Tri ele flask?

Not really concerned with budget, I can work towards whatever seems best as long as it's not sublime purity of fire levels of investment.