Feixiao's Crit Rate

My 70/180cv is doing more dmg than my 90/120cv. There's only about 50atk difference between the two.

My understanding was that the high crit rate requirement came from her teammates crit buffs. My team will only have Moze to buff her dmg output. Does that mean it won't matter too much in my situation? Or was I just hitting some good rng on the few times I tested?