Here's another pic with the deformer X shown.  No translation all X rotation. I moved the center a bit to make the chin recede a bit more from the hinge. This is as reasonably wide as I can get the mouth. But I think it is still off .  When I open my mouth I get more of a gap between my top and bottom teeth in the back than what you see here.

What do you think, better befor or better now? Somewhere in between?.

Like I said I still need a JCM for the lips to deform properly. I want to get the center right first :)

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A HOMELAND FOR POSER FINALLY