Hi @andyb_83,
Thank you for the detailed report.
I have just pushed a new update to the plugin with improvements and additional adjustments related to NPC movement. Please update to the latest version and test it again to see if the issues with the movement behavior have improved.
I will also review the NPC naming behavior related to the removal of NPC Spawn to make sure their custom names appear correctly instead of showing as Heavy Scientist in death notes.
When you have a chance, please test the updated version and let me know if the problems have improved or if you are still experiencing the same behavior. Your feedback will help me refine it further.