Unfortunately, mirror mode is still in beta stages, and isn't as stable as most of us would hope... It has a hard time loading objects sometimes. which causes issues. Hunter is a skill that requires A LOT of object updates every ms. So I would recommend using injection. That's what myself and most people use. Yea mirror mode sounds exciting in the big picture, but just doesn't perform efficient enough for a super active script such as hunting.
Done, Done, + Done! Enjoy the script and please post some progress reports!