Some of this was an OOTP problem in general that was addressed over various patches, most of which are fixed now. For example:
Changelist (25.10.95)
Adjusted some player creation/development modifiers for long term balance
Changelist (25.9.90)
Adjusted some development speeds
Young players should develop to moderate ratings faster
Slightly reduced aggressive talent shifts
Changelist (25.8.87
Adjusted IAFA development
Changelist (25.8.83):
Updated Player Development
Fielding ratings will not age as aggressively when players first start to hit the aging years
Fielding ratings aging will be impacted by other factors, such as speed and player body types (heavier players will lose fielding faster than lighter players)
Changelist (Version 25.7.80)
Slightly adjusted some player creation/player development settings
A lot going on with development over several patches
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