Bear in mind that Morph Manager is old software - Poser 4 vintage - and doesn't understand many of the newer techniques. If you do want to try it, please test on a copy of your files because it might break more than it fixes.

The same caveat applies to CR2Editor, by the way, although it's less likely to destroy features that it doesn't understand. Things like eye movement and chest size that you mentioned are done by ERC rather than morphs, so this sounds like a job for CR2Editor to me. I'm not sure where the best ERC tutorials are to be found these days - you'll need a guide for sure! Hopefully someone else can chip in on that score.