Hi there!
I didn't understand this sentence you said:
One of the ways I package my game is by taking all the files in can in the "data" folder and copy pasting them into the rmmz_managers.js variable fields.
I got that you are having a problem with the Actors.json, and the crash error is giving you "actor undefined". If it giving you actor undefined, that is probably something related to the database of your package (you mean a deployed version?) don't have a specific actor that the game is requiring?
I can't understand it right, sorry. And most importantly, what this does have with my Balloon position plugin?