I have been playing hard tackle in all the teams for the last 3 seasons, and i dont see nothing diferent, maybe a higher number of tackles made only.
Cards like injurys i think are just random, sometimes you get tons of them, while other time you dont get any.
In my team A a Z FC i got already 9 injurys but only one yellow card in 6 games.
In my main team i got only 1 injury but 3 yellows and 1 red in 5 games.