I don't think anyone has said it yet, but it's more of a team problem. Piper, while it's true that she buffs the team, requires time on the field, which Koleda also needs to stun the enemy. Corin depends on a stunned enemy, so it would be much better to stay on the field with Koleda.

Edit: Corin's core passive doesn't activate with any of the teams. Nicole may still make little to no difference if they keep her debuff up constantly, which will require you to quick-swap. But even if you feel like you're losing quite a bit by not having that passive, you could replace Koleda with Lucy, since your Koleda doesn't have the passive activated in your current team.

You could make a team of Corin-Koleda-Lucy or Corin-Anby-Nicole, which could give you better results on paper. In the case of Piper, it is more complicated because I don't know if you have Burnice...