I'm mean moonballing almost every shot. He is also my best buddy and i have nobody else to play tennis with. Today i have played with a coach and i was playing way better than i used to do with my friend because he was feeding me with regular, fast balls, not moonballs. I was positioning better, chasing the ball better, coiling/uncoiling better and i can't do these when i play with my bud. You think a moonballer partner prevents you from improving your technique ?