[twins_34]

This has absolutely nothing to do with the development lab and has everything to do with players from the age of 27 to 30 taking hits on their defensive ratings which is going to be addressed in an upcoming patch it just hasn't been released yet. But the issue is not the development lab the issue is just players losing defensive rating at a sharp rate between the age of 27 to 30. You'll notice that they're bat still seems to be just fine but their defensive ratings just fall off the table. But the devs know about the issue and they are working on it so yeah your issue is just defense ratings taking a jump off a cliff. One way I'd probably fight against this is set aging to much older for right now and then set players aging speed to like 0.900 to 0.850 . That might help with the defensive rating drop off but it is at least something you can try.