Advise for 2nd gatekeeper

I’m at the second gate keeper for the first time, and I feel like I hAve been stonewalled. I am using a front line of Dr in ss and penguinator, into storm lock with last bite at the end.

Nevermind. I finally beat the second gatekeeper for the first time. I got to call mvp for penguinator with desperate bite and and overwatch. Was on the 5th spot and was my last monster with nebel dupes.