Brook, it sounds like you're maximizing your storage space at home, but being realistic about how many you can possibly have. This is one reason I haven't done too many foam pumpkins. It's too bad you can't just fold them up flat when it's not Halloween.
I like your idea of rotating the collection though. This will give others a chance to enjoy your older pumpkins, while you change your display enough from year to year (maybe aiming for specific themes). That will keep your visitors coming year to year, so see the new ones.
I like your display style. Pretty unique, with your use of lasers and neon paint and blacklight, not to mention interesting shelves and hanging methods. Can't wait to see how the final display turns out for 2019!