Mark regarding your five injuries sustained since 19/01, you have clearly made a big change to your rhythm or match bonus looking at the game vs Bergies on 19/01 compared to the games after that, this will cause even maxed players getting injured.
That said, out of the five injuries I saw only one player has max toughness and one in the high nineties. The rest are between 55 and 70.
Again, all injuries seem pretty reasonable with the parsmeters set in your strategy and player injuries.