You're averaging about 18 plus points for each player. I'm averaging about 25, but my freshmen have better WEs, and I don't put as much into formation practice as you do. For freshmen, the potential doesn't really affect them much unless the guy is an STL or "tapped out", so it looks like you're getting the right results. If you want to see more improvement, get them playing time, or shift some practice minutes from team practice to position practice. You can also boost their WE by getting them starts.