Well that's because you're doing all or almost all 1v1 forwards. I used to do a lot of that myself, but then I decided to try to get serious about training a U21 player with Len Smiley and Billy Ray Gansler, and I realized that just doing 1v1 was a bad idea. It's pretty widely agreed that 1v1 forwards gives the most pops, but if you're serious about building a U21 or NT player doing a lot of 1v1 forwards will never get you there. You need to do things like defense, passing, rebounding. I would forget about 1v1 and work on his primaries for the rest of this season and next season for sure.