just to say, as  someone who's also into tweaking figures, making morphs isn't that hard to start doing.  i mean, it's hard to get good at it, but it's easy to start. personally, i'm using Blender 3d's sculpt function right now, and liking it, but you could use anything you're comfortable with.  if you have Poser 7, the sculpt brush is said to be really effective. you could take your original reference images and develop a chest morph based on those. then it would fit the outfit and be more realistic than V4 with non-NGM morphs. 

that said, did you check how NGM Petite works?  is it presets for  NGM with Morphs++, or are is it  also new morphs that change chest size?