Anti-tunnel suggestion.
We already do have an anti-tunnel system in place, which gives an unhooked survivor 10 seconds of endurance and haste, but frankly that isn't enough. If the killer still really wants you - for whatever reason - they will get you. The 10 seconds usually isn't enough to get anywhere even remotely safe, and experienced killers know to just wait out the timer anyway, often times even trying to body block you from getting anywhere. It usually happens that even while chasing the unhooked survivor, they'll catch up unintentionally just after the endurance effect ends. But also, the problem with the current system is that survivors can also use this "invincibility" to try to body block for their teammates. Any handicap given to any side can be abused, so we have to be careful.
Here is what I propose:
1) Extend the duration of the endurance and haste effect to 30 seconds.
2) Starting 3 seconds after being unhooked, if the unhooked survivor takes a hit while in close proximity to another survivor, their deep wound takes 15 seconds to mend, AND they get the broken effect for 60 seconds.
3) None of the above happen during end game collapse. Otherwise it will be a free escape.