Bugs might be the best

I was stuck on 11-9 and switched my squad placements to start with bugs and he was destroying. The mission is 324k cp and my bugs is 250k cp. he easily cleared everything until the boss. And on my 2nd pilot joey was able to finish him off and get a 3 star. I also just switched my teslarite on bugs and am now using the blue one instead of yellow it definitely makes a difference.