Doryani's Fist idea - power charge stacking

Power charge stacking has some nice synergies with the big ol' fist. You can get some good sources of flat damage (the ephemeral bond, and on rings) which is great because the slam gives 600% added damage effectiveness, you get a boatload of %increased damage from Auxium, and you get crit. Add in as many sources of +attack crit as possible (gloves corrupt, hunter body, assassin ascendancy), and you can actually get pretty decent crit chance. You can also get Second Sight since the slam has 100% chance to hit. Assassin is the natural ascendancy pick since you can get +1 charge, base crit, and other goodies, and we get one more charge from Swift Killer.

Here's what I've come up with so far, 4m sirus dps with scuffed (but not terrible) defenses (other than only having 4k es...), but should be pretty smooth mapping since it can get 4 frenzies, has good aoe, and doryani's gives a ton of ES on kill.

https://pobb.in/3YIj3gmVYdg4

I've been keeping the budget fairly low so far, and in fact a truly budget/starter version of this should actually do decently well I feel. I think this idea has pretty decent potential, but I'm having trouble scaling both the offense and the defense further. I'm hoping that the more experienced build makers out here can figure out things that I haven't thought of, so please chime in if you have any suggestions!