need help in Proving grounds - Maul

I am totally unnerved, I just can't beat Maul (and also Tie Interceptor and Darth Malgus) in Proving Grounds.
This is setting me back month by month.

When I read about Proving Ground, they say you can beat Maul with any GL, except SLKR, but I have JMK and I get defeat after defeat!
I should have the necessary pieces in my roster, but I just can't beat it.
Please advice me what exact composition to use with characters from my roster!

This is my roster
https://swgoh.gg/p/142831613/characters/

Example:


Thanks a ton!