PoE Cast On Critical Strike, Slam builds without Warden

So as a ongoing project, my STR stacking zerker is now with 9.8k life and 1770 STR, About 1.4m DMG per regular Ground Slam and about 4.1m with Vaal version. Max DMG should be around 20m with the last strike from Seimic+Intimidating Warcry+ Berserker. Though the build could hit way harder using critical since my current mult is 333% but at the moment i lack a reliable way to generate power charges even though i was messing around with CoC and assassins mark. 30% crit chance now, would go to 50% with 4 power charges Bottled faith AND charges would put me around 70% crit change but i dont ha