The velocities are pretty good for your age, cause you still have this winter to mature physically for the spring which usually will add a couple miles per hour on it's own at that age.
Honestly though I would drop the cutter from your pitches, it is a lot like a slider which can be really hard on the arm. I would guess you'd like to pitch for a quite a while so arm health is key.
I would add a changeup in it's place, maybe even if you don't feel it works in games well, keep throwing it in bullpens (Although it should be very effective in games, drawing weak contact often). If you don't like it now you will definately appreciate being able to throw it a few years down the road.