I actually don't mind facing Chaze in arena - I'm hovering between 20-10 at the moment and have broken into the top 10 several times. Many of the teams here have Chaze in some form. I run Rex (L), Thrawn, Shore, Palps and Nihlus. Generally Thrawn goes first and fractures Baze, Rex uses Ten Up, Palps then stuns and Nihlus uses AoE - after that Thrawn uses TM switch and Nihlus then goes again and dispels Chiruit if he gains HoT from countering. After that its easy.. Nihlus can usually anihilate on the 4th tur if I get good coolown reduction.
I don't get why Chirruit is so good - he never really seems to do anything against me except gain HoT and counter attack - his attacks do literally nothing to my Shoretrooper?