I think the minimum cub training progress to get a stat boost should be lowered to 50% for three simple reasons:

1. It's hard to get males up to 75% when the adolescents can only get training through patrols, which can only occur once an hour.
2. If you have a lot of females, like I do, it's almost impossible to get them all up to 75% when only two adolescents can watch the adults hunt at a time.
3. If cubs don't do well in their daily training (as in they don't get at LEAST 25% from those seven sessions) there's basically no chance of them hitting 75% even if you send them on every possible hunt/patrol.

Because 75% is so difficult for me, a college student who is in classes six and a half hours a day, four days a week, and busy with projects the rest of the time, I think the minimum should be dropped to 50%. The stat boost could be lowered accordingly, I don't care. Just make it a little easier to get ANY stat boost and I'll be happy.