Hi, I just cleared the instance. :D YES! :victory:
Thanks to mixing all the advice I read here I worked with the ninjas I have. I took War Kiba as my aoe ninja, Karin as my aoe (although her poison often meets an enemy immune state) and healer, and Hinata as acupuncturist. But more importantly this team reaches a 5 combo length.
My Azure Fang is 3* and at Jounin level, Hinata 3* and at jounin level, Karin 3* at Chunin level +2 and War Kiba at 2* at Chunin level +1.
At this time my Azure Fang is level 54 and my team's power is 8724.
For the formation I used, you can refer to the image attached.
All the best, and I do hope you get past this frustrating round.