The DAZ injection morphs are setup to work on the first figure in the scene.

You can't inject properly into the second or subsequent figures loaded into a scene.

Start from a blank scene (i.e. one with no default figure loaded), load figure, inject morphs, adjust as desired, and save to library. Repeat for each character. Start new scene load characters previously saved to library.

For P5 and P6 the trick for getting the BodySuit morphs to match is :-
Select the Figure Body, then Ctrl-C or Edit | Copy
Select the BodySuit Body, then Ctrl-V or Edit | Paste
Repeat each time you alter the Figure morphs.