You can definitely still see 10+ points improvement as a FR is the player has high enough potential and WE.
Alex Myers on my GW team improved by 10+ points in 5 categories as a Freshman, and after his FR season + 1 offseason has +12 ATH, +16 REB, +16 DE, +16 BLK, +18 LP, +23 ST, +14 DU.