It appears there was quite a lot wrong with this plugin - I'm getting there. Please bare with me.
In this update: - A whole Event system rewrite.. Why? It was incredibly messy and rushed. - Fix was implemented where MobDMG wasn't allowed in return regardless of the Config settings. - there was a few other things, but time is limited. So here.
Note: Mobs will continue to look and maybe even sometimes follow you. This is a bug I'm investigating. This release was to ease bigger servers with this issue as I know mine was surely struggling.