Put a time limit on how long Adrenaline can hold for...
Seriously, your perk system is horrendous. There is only a few worthwhile perks and thus everyone is picking the exact same: Adrenaline, mettle of man, decisive strike. You can't hook anyone because people will stack decisive strike to punish you punishing unsafe hooks, and then they get a free heal from adrenaline because the exit gates were powered up 60 seconds ago, and then they get a 3rd free hit just for having Mettle of Man on top of that.
Seriously, give Adrenaline a maximum hold time. The game is hilariously pro-survivor enough without them just having a guaranteed free heal no matter how long it takes them to unhook after exit gates are powered. Every single survivor does unsafe unhooks now because every single perk somehow lets survivors get away for free after an unhook, and killers just get punished for daring to punish unsafe rescue.