PR manager will increase your income,but to get this you must show good performance to your fans...
if the team running bad it means will decrease your income...
so i prefer to get better trainer to improve my performance then higher high level PR...
I think with only level 3 doctor your player condition will more stabil...from my exp last season
my player get injured in the middle of game...but after the game he still healthy and can play for next game...
happy BB