3.20 Build Help Wanted - Berserker, Smite, Voidforge

POB: https://pastebin.com/dKePqFRH

This is the first build I made myself with inspirations from other ascendancies on poe ninja. The goals for this build are super fast map clear (it has that) and sanctums. It is lacking frontloaded damage in sanctums because of the need to start from 0 rage on the entry of every single room. While at 50+ rage the monsters die in miliseconds. I'm willing to give up a lot of dps on the top end if I can find a way to make the damage more frontloaded. I want to keep using voidforge so no Red Blade Banner shenanigans.
I would like to hear what you have to suggest but as for my own thoughts:

-Find a way to use the War Bringer ascendancy. If I could jump start my rage to above 20 it would solve all my problems. But as far as I can see only the red blade banner has the unique mod of giving us infinite power on warcry. I havent figured out fully yet if a Guardian in the Sanctum is a unique enemy. Assuming it is it would give me 40 rage which is good enough

-Find a way to add shock into the equation again (Secrets of Suffering doesnt allow me to for my hits). Maybe I don't need to attack super fast (even though I think I need to with Voidforges random elements applying random ailments). Skitterbots could provide me with that but I don't know if I need to scale the effect. It's also a huge investment with me losing offensive anoints to get the reservation efficiency needed

-Seeing as the Protector Totem is just used for the Attack Speed buff maybe I should scale the effect of said buff with notables like Panopticon.

-Finding a good Forbidden Flame/Flesh combo. This is a little bit obvious for more raw damage but I would want to think outside the box and also limit the cost a little bit

-Find a way to get onslaught into the build the 20% more attack speed could be the missing speed I need for it to feel good enough in the sanctum without rage and blitz charges. The Maven Flask is probably not needed and could be exchanged against a onslaught flask. I have to admit though that I dont know when I have to equip it because entering the sanctum doesnt give you full flask charges I think and I would need to have a use RIGHT AT THE START of a room.

-Just getting Aspect of Carnage for more raw damage. It would be the last straw for me but a way to negate the ramping problems of this build. Together with Abyssus though mapping will get extremely rippy as of right now I managed to not die for 4h of gameplay in juiced t16 but I fear that will change quickly once I get Aspect of Carnage.

That's it, I would be very happy for any input for optimization for sanctum. Assume I know nothing because the game is very complex. I'd want you to not focus so much on my rares because atk speed, crit chance, crit multi is something that can always be pushed further. I would want you to focus more on some "major" changes like the ones mentioned above.
Thanks for reading this and thanks in advance for the people taking their time out of their day to make my build better

Greeting Chilibringer

Best tip for rage in sanctum - buy the redblade banner shield but put it on your weaponswap, at start of every room you weaponswap and cast any warcry, you get instant max rage and swap back to voidforge - your rage will stay maxed, it doesn't reset on weaponswap. Did that on my rage vortex character and it honestly saved the leaguestart for me.

You sir are amazing. My mind was almost everywhere but there. This is the easy solution I was hoping for.
Thank you thank you thank you!!!