Aren't they nordgens too?
Nordgens is now used for all fast-growth players. It isn't important from where they come, only important is that they have good skill progress. Personally, if player has 18 years and slow growth, I don't need him, I would rather buy some older and cheaper.
Forgot to add about academy; try to set up your academy training to finish at the beginning of season. This way you'll get that players for sale at the right moment, when you need money and when it is easier to sell at same time