If your son is hitting the ball hard, breaking a 7.0 and is an A student. You really have nothing to worry or fret over. He'll be fine. The right school will take notice. And when they do they'll make their intentions clear.
I understand your frustrations . Try to remember that more times than not these RC's don't do anything until someone moves first. In other words you need an offer to really kick off your sons recruiting .
Once you receive an offer and notify the other schools on your list that you've received that offer and are seriously considering accepting it, your email is gonna light up like a christmas tree.
My son ( 2016) received his first offer in 2014. Prior to that he had emailed UCLA 5-6 times. Nothing. Not a peep. He sent them an email that he'd been offered and was considering accepting....... UCLA responded in less than 10 min. And had him throwing for Savage within 72 hours .
But once again, your son sounds like a solid ballplayer. It's all gonna work out