while this may look false but i had success with this. you can call it an exploit. just find the day your youth intake comes to your club. save the previous day and load that day to find the players you want like last year. i checked this many times and sometimes by doing this you can get a golden generation even when your youth intake preview is bad. i tried this with many teams as i wanted to check whether this works or not. in one of my saves with fc tokyo i had a crap youth intake preview where the hoyd said none of the players look good.i intially got a player with pa 120 nad others with pa 100 and lower(checked using genie scout). then loaded the previous day and i got a player with pa 183 with two players with pa 140 and 135 and 3-4 players with pa about 120-130. this can be false or something but i had success with this after trying this many times with different save.
also a tip i recommend is when you go to sign a player with youth contract check whether you get recommended
as youngster or future prospect. if it is the latter sign him. i once had 2 star potential youngster in my youth intake and when i signed him to a contact i was told his playing pathway to be a future prospect. he turned out to be better prospect than the 5 star potential player who was termed one of the best.
also recommend you sign a player with personalities like model citizen or model profession or professional. ever players with fickle personality you should sign since he has high ambition and will likely improve.i never sign unambitious or low determination player unless they have good potential then by which you can mentor him.