A couple of observations.
Not sure I would "teach" launch angle. Just teach an understanding of what the ball looks like in the tunnel and outside. In other words, hitting the top is not necessarily "bad."
HS outfielders are just as bad as infielders. I have seen as many errors, and bad routes, in the outfield, as errors and bad hops in the infield. So if you think hitting it on the ground gives you some type of advantage over fly balls in HS, it doesn't.
Ground balls suck. We are one of those ground ball, dink and dunk teams. If you have great pitching and can keep games close, and can scratch a few runs across, it can work. But against any good team, you're toast. When you're down by 3, you need to be able to put runs on the board. You need extra base hits to get runners into scoring position and get them home.