Motor size question
I, for one, would like to hear how it goes.
I think that you should be O.K. with this combination.
When I am training new pilots with flat bottom wing trainers, we rarely get over 1/2 throttle. Throttle management comes somewhat after learning to fly a rectangular field pattern, maintain a set pattern in one quadrant of the sky and other goodies like this.
Take care and enjoy your flying.