Are you playing on PC? I do (but no mod). I wonder if it changes something.
In my last season 50 was a good slider for injuries. In that season it looks a little bit too much, but my team suffered from 4 injuries of 4 weeks or 5 weeks in one simulated pre season game. Since then, I average one more injury every week (plus a couple of players out for game or for a quarter). I'm not totally convinced by 50, but it looks closer to what Armor and others have with 23, so that's curious.