Hollow palm ground slam zerker help!

Hey guys , im running a pretty expensive hollow palm zerker build , and while it doesnt feel lackluster, i feel like im missing about 10mil dps on PoB community,

is there any other features im missing that anyone can think of or is my build just not hitting as hard as i calculted it would !

heres the pob link https://pastebin.com/6Kd8zATM