I play a CLS, OB, han, r2 and trawn team that works so good...
I find teams with baze/chirrut much more easy to beat then the ones with GK or OB
I think u need 100% sure R2 in ur team (teams with no R2 are a joke in defense...) so u have 3 options:
-Keep ur team as it is by the moment
-use han instead of trawn (but trawn really help with fracture...)
-ooooor just delete chaze from ur team and put in Han and old ben (or GK if u prefer him) i think its ur best choice, hans shoot first is almost mandatory... As well as trawn fracture... And having OB to taunt/mind trick, and trawn to regen protection u dont need a healer... XD