How to win p1 executor mirrors going second

Before the p1 got introduced I used to be able to beat executors, profunditys and leviathans consistently with my executor to get rank 1 in fleet arena nearly every day, now however with a r8 piett I’m stuck around rank 8 beacause it’s impossible for me to win the mirror against r9 pietts.

is there any specific lineup or any tips so I can beat the executor mirror match against r9 pietts (going second) or is my only chance to beat the mirror to r9 my piett and it be a coin toss to see who gets the first turn?