The Cardinals are both around 200 blocks (I think only the Emperors are over 200). I figured largeness was the physical size and didn't realize it was actually the space taken up. All four propellers seem to be properly done, though I'm not sure if maybe the different Y positions mess it up? Two of them are lower and two of them are higher, and all four are at the same X positions (they share Z's in pairs). I'll try removing the top two propellers and see if that helps.
Edit: I tried the propellers but no dice :/ It didn't seem to change any of the behavior. I'll try rooting around in the config to see if there are any mistakes, though I did allow Toolbox to create the config automatically and then just checked it for errors afterward. It seems to usually work fine that way (apart from occasionally throwing in the extra model line, which I always remove when it happens).