Help for my Brainrattler-Doryani's prototype build

Hi everyone,

I just switch to a build i wanted to try : Doryani's prototype, 100% phys to lightning conversion with brainrattler

https://pastebin.com/xMd4UqCX

I convert the lightning damages i take 50% to fire (with amulet) and % to chaos (with the timeless jewel).

Ennemies have -172 lightning resist and i use earthquake, with seem to fit the best the 2h mace playstyle.

It goes easy ti red maps, but is slow (mace + earthquake) and struggle a bit at t14+.

I knew it would not one-shot shaper, but i was expecting a lil bit more damage, considering how low is the lightning resistance of ennemies.

So how do i take it to the next step?

Find a way to convert 100% phys to lightning without Brainrattler? (i have a huge atziri's disfavor ready)

Get better results with some cluster jewels?

Change my auras, maybe with a curse?

Change my gem, if another skill would fit more? Maybe a non-slam one?

My budget is not that high, i'm kind of a casual.

I would take any idea, if anyone has done something close it it with success.

Thanks to you all, and stay safe exiles


PS: my fire, chaos and cold resists are 75% even tho Pob doesnt show the effects of the malachai rings.