Phoenix Squad Modding

Hera - Speed x4 potency x2. Try and get as much speed as possible.
Circle - protection
Triangle - protection for Thrawn event, offense or CD elsewhere
Cross - potency

Ezra - Offense x4 crit chance x2.Again, speed it up.
Circle - protection
Triangle - CD
Cross - offense

Zeb - crit damage x4, potency x2.
Circle - protection
Triangle - protection for Thrawn, CD elsewhere unless you already get one with decent speed.
Cross - potency

Chopper - speed x4, health/defence x2 whichever has better speed.
Circle, triangle, cross - protection

Kanan - health x4, tenacity x2
Circle, Triangle, Cross - protection

For Thrawn event:
Could also do +protection arrow on Kanan if it has decent secondary speed (+10-20). He's slow as heck anyway. Same works on Chopper if you already have decent speed on him: extra protection helps for Thrawn event.