EK - Void battery

I try this build and look strong enough .
Im lvl 75 - 7k es / ci and 240k pdps 95% crit with power charges .
Now need some help - any ideaa how to improve this build and how to generate power charges fast for boss kill ( ubber ) ?
My gear



For mobs very easy but boss can be hard somehow .Can change to shav and take amu + 1 curse .Need take es on rings and mov speed for belt .In some days change chest with another 1 but this need craft ...

Helm need craft too . This i know .
Problem its how to generate fast power charges in boss room ?Second skill with pcc , flasks with 2 mobs , flask for 1 pc , diamond flask can be something . More ?
My tree
https://www.pathofexile.com/passive-skill-tree/AAAABAYBAAMeBUIHHg18DdEOSA-rD8QQkhEvEVARlhXXFr8bJRvIHU8fQSBuJIsnqSoLKjgqUysKLJwspiy_LR8yMjQKNbk3ZjeDO3xBlkSrSVFLrkyzUDBVrlZjXIpd8l9qYpVjQ2SdaoxtGXBSdf1-WX_GghCEb4auj6aP-pDWkyeVIJUuoS-io6LZpuunK66zsNiycLQMtUi4yrmTvG--isHzwwnDOsgUytPP3dDQ0PXUQtlb2YbbXt-K37DjhOkC6rrrY-v17Bjw1fId9W8=?accountName=ifrimgabi&characterName=Kwan_Shadow
Now im ci because this give me huge deff and its much easy for lvl up . After can go low life with dual curse .
Have any ideea how to improve this ?

Blade Vortex + Power Charge on Crit. Add Increased AoE and maybe Spell Echo / Increased Duration for more reliability.

Also, I really suggest using Poison instead of Hatred + Added Fire. It's just a lot more damage if you scale it right. And I mean a LOT, like x4-5 at least.

Blade vortex + icc + pcc + ? . Can be best ideea .Poison can try too and i think to use point blank if work with this skill