The second iteration of 2v8 is now LIVE - find out more information here: https://forums.bhvr.com/dead-by-daylight/kb/articles/480-2v8-developer-update

Rapid brutality suggestion

Ok, this might be too late for this, but here is my take of how to make the perk better and not OP.

Rapid brutality- After hitting a survivor with a basic attack this perk activates. After 3 seconds you gain a Haste effect of 5% for 15 seconds.

You cannot gain bloodlust while this perk is activated.