It wasn’t one particular arrow, the school had at least 10 of them and none of them exhibited this behaviour.
I flew many Warrior’s too and not a single one of them needed a continuous right rudder input like this does. I know that the effect of the prop would cause an element of this behaviour but I’m finding it needs about 8 units of rudder trim to fly straight. With the greatest will in the world, I don’t think that’s correct.