Single target suggestions for chieftain

Heyo, typical AFK abyss abusing MF chieftain here, Pob for no reason: https://pobb.in/uHGzKhvrXwPX

I wanted to ask how i can get away with increasing my single target via removing my MF gear (ring, boots, gloves, chest) so i can participate in some of the challenges that involve killing a boss or simu or heist or whatever,

Simply swapping mf peices for rares or uniques and adding in (insert single target skill here) in these peices and call it a day doing enough dps to clear bosses,

Was considering penance brand since thats what all the fuss is about on a cloak of flame or maybe bodyswap? something like that,

I have the budget to do so i just dont want to level again as i am horrible bad at it but lowkey enjoy doing so once a league start,

So if anyone has suggestions which skill or unqiues scale well enough with this character please let me know