No, Aki never got break (at least I don't remeber him using it and he was in my party since he joined).
Also, changing tactics rarely works cause 90% of the time the MC got his turn, the situation had already changed again and either there was no point in changing tactics or you had to do something completely different anyway.
Not to mention, setting Aki or Junpei to support is BS, as have one support spell and are mainly attackers.
Setting them to support is madness (and Sparta). They'll use exactly one support spell until they start passing.
Considering that often go before the MC (plenty of personae have lower agility), they start battle with like Rakukaja instead of dealing damage, prolonging it and risking it turn into chaos.
Between the round the MC issues new tactics and the next round when he can change them back a billion things can go wrong.
Especially in later dungeons the MC could easily get dizzied, confused or otherwise unable to issue tactics. Then the enemy can easily have his way with you.
It actually all boils down to crappy ai and the inability to change it frequently enough.