Don't put as much pressure on getting a pop on your guy each week.
If you have a good prospect, I imagine you'll be wanting to train him for 3-4 seasons. This being the case you are going to have to train most of his skills more than once or twice.(multiple weeks each)
Concentrate more on getting the full 48mins. Once you are doing this consistently you can be confident even when he doesnt skill up he is getting a healthy amount of sub-level training. Everything helps!