At this point just delete iron will and make it a basekit perk..
Every other survivor gets the perk for free now adays and makes next to no noise when injured (looking at you A2) may as well make it official and just allow people to play survivors who are naturally loud without being at such a huge disadvantage..
The devs have known this has been an issue for years and yet still release new survivors who make almost no sounds of pain why?? Commit either make all survivors quite or make all survivors equally loud!