Just a simple question on .xml editing

[nufndash]

Well just because I can't seem to leave well enough alone, I thought I would try to solve this minor problem.  I have JFF and use it quite frequently without really understanding what is going on.  Somehow through trial and error I have come up with a .xml file I really like. (when the breasts are normal proportions).  I have mods like MME, SGO3, ABBA etc., that change the size of the breasts and when they do, the physics seem to dampen quite a bit.  Is this because in the xml file,  the center of mass(what I believe is the area the physics work on), is stationary or close to the body and with smaller breasts is closer to the center of the breast. But as the breast is inflated, the center of the breast moves, but the center of mass does not?  I have tried to mess around with the center of mass values, but either I am not using the right ones, or my thinking is way off because nothing is changing.  Just checking z=up/down y=in/out x=left/right in terms of the axis? One of the more knowledgeable members gave a great tutorial of this, but it was buried in a thread somewhere and now I can't find it.  I was trying to move the center of mass values "out" farther from the body or 0 position to see if that made a difference. It is quite possible though, that I don't have a clue to what I am doing and my thinking is all wrong.☹️