I hope you aren't teaching launch angle. Don't sip on that juice.
I'm old school. Line drives and ground balls are good. Ball in the air is an out.
Knob to the ball isn't what I teach either but keep the ball out of the air people. Fly balls are easy to catch.
I advocate hitting the ball hard in the air - line drives and deep fly balls. Those are the hits that consistently do the most damage, at all levels of the game.
I have yet to see a ground ball go over an OF fence for a HR. Not even once.