About the issue where your game is showing as having deleted DLC's or lost game totally. Go to your Steam app. Go to Steam < Settings < Downloads < Clear Download Cache. This should restart Steam and you should have access to your game & DLCs.
Reduce survivor speed ?
Most ppl will dislike it but I feel this would help deal with all the pallets and meta perks nearly impossible to deal with.
It would also force survivors to sneak around more.
Aren't we suppose to be scared of killers ?