PoE Feeding Frenzy, Mine builds

I was taking a look at the new skill gem Pyroclast Mine of Sabotage and thinking of ways to utilise that huge flat added fire damage from the mine aura. I wanted something that hit often but required minimal input from me so I could focus on throwing mines. my character if it had lived to level 90. I settled on trying the AW minions from Chains of Command, utilising the Rakiata's Dance Greatsword for the elemental resist inversion. I got the character to level 80, but was a little confused about how little damage I seemed to be d