Need help with Elite 6-7

For a while now I’ve been trying to finish elite chapter 6 so I can get to chapter 7 but although I’ve gotten 3 stars on nodes 1-6 in the chapter, I cannot beat node 7(Flounder Station) All of my guys are level 60. I’m using fantastic damage to get around the resistance of the enemies yet no matter what team combinations I try, I get destroyed within the first two rounds of the 3 rounds. I’m open to any advice as this is getting very frustrating.

Upgrading is the only way :man_shrugging:

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