V4_MouthHeight2

Here's a custom morph that's basically identical to V4's Mouth Height Dial. I used Blender's proportional editing and face maps functions to smooth translate the surrounding mouth areas and inner jaw and tongue actors I then applied as FBM and used the Match Centers command to have the actor's origins follow the morph translations. I set up the dial so that a value of 1 will move the mouth and mouth part actors down, as you seemed to want...