Am I overly worried about the regs? Should I just wrap up the regs in some clothing, sandwich them between the BCDs, and arrange our fins around them to provide protection from bumps and squishing?
Any scuba gear packing trips you'd like to share?
I think your regs would be fine either way, especially if cushioned well in your checked luggage. They are built tough.
I always pack: fins, wetsuit, BCD and misc stuff like SMB, reel, etc in my checked luggage. Nearly impossible to break that stuff from the luggage being tossed around.
Reg, masks, computers, camera go in my carry on. I only have a gopro, so I have plenty of space in my carryon backpack for my reg. Others need more space for their camera, so that changes the balance a little.