I've had the same problems. Some stuff, you need to get bent over on. For the deco, you have to put something solid in between paths so they dont connect. I'd go with an invisable collision hull wall. You dont want the wall hitting the deco, cuz things start going wrong with online play.
For the doors, you can't seem to use the grabtrigger. The bots don't recognize that. If you use that, you still need to set the door to busetrigger true. Thats what the bots use.
Spank you very much