My 12 y/o has been playing tennis for 3 years. His first real racquet was a junior sized Head Extreme. Then he moved to the adult Wilson Ultra 100L. The coach says he needs a heavier racquet. I am looking for some racquet suggestions for him to demo. He can generate a decent amount of pace and spin when he times the ball correctly. He can hit deep balls from the baseline. As you would expect, he cannot always control/place the ball, especially if he hits it on the run. I'm not sure where to start in terms of his next racquet.