I think your local delivery system needs some attention from the district or regional management for one. The amount of delivery damage you see seems high IMO. You need to insure and start taking video of the box openings as proof you aren't doing it, as denial has been a growing form of customer service pretty much everywhere.
I would say there is something lacking in the packing or mnfg packaging as well unless the box looked like a hi-lo ran over it.
Im curious of the time frame of all of this... it's approaching a reference charts worth of complexity. (not your fault it seems)
Hope can be a heavy load to drop all at once and not have it land on your toe. I was there during another era. I can only wish you better luck in future choices and maybe suggest exploring other manufacturers more and maybe some used "great runners"...like a pampered used car with all the bugs worked out 
. I don't quite have a bead on your collection style for the rails besides passenger cars and "small crowds" but imo you're too invested personally to "sell it all!" and and give up ... you have to adapt. Maybe stop to appreciate what you do have and do for while.
