I was giving the game another go tonight. It seems all my problems with Luculla forest are "left over" bugs that were not resolved. I seem to be having the hit % problems with the npc's/monsters on the west side of the map. Going to the mines and killing off those goblins didn't give me too much of an issue.
I would recommend killing off all the goblins to the mines and even the immaculates there until you see those invulnerable knights. Then you should be able to go to the immaculat trials without as much of an issue.
There are still problems, but I can clearly see improvements being made. Huge ones.