Dislocating Genesis' Jaw (need mouth open wider)?

Lissa_xyz

I tested some mouth morphs between V4 and Genesis and dialed them in exactly the same.

V4-
MouthSize 125%
MouthOpenWide 200%

Genesis (settings > limits off, as percent, also dialed in V4's shape for the sake of consistency)-
Mouth Size 125%
Mouth Open Wide 200% (does absolutely nothing beyond 100%, even with limits off)

As you can see V4 (left) still looks completely normal and could be used as a decent horror character.
Genesis (right), on the other hand, looks like she's got lock jaw and a horrible collagen injection. It doesn't help much that Mouth Size on Genesis also scales the inner mouth, while V4's version does not.

Ideally, I'd like to go for something similar to the screencap from the movie Jennifer's Body. My main preference would be like the custom morph from MortemVetus' Shrieker character (http://www.runtimedna.com/Shrieker.html).

Could someone please point me in the right direction to get me going on morphing Genesis' mouth/jaw region to extend it? Not sure if I can just morph the jaw and the chin/mouth will auto follow, or if I need to morph the whole bottom half of the face including the jaw. Thanks.

/edit
I have Blender and Sculptris.

WendyLuvsCatz

Genesis 2 basic female might work better (I am not on my pc)
she has a rigged jaw

Lissa_xyz

Yea, she does. I have a feeling though I'll have to create an extreme morph which would cause me to have to adjust the rigging in DS to move the bone for the lower jaw further down so I can get more of a straight down opening rather than an angled one that causes the chin to merge with the neck.

KickAir 8P

This may help a bit: Mr Hyde fG has open wide and smile wide morphs that can be added to the Genesis morphs and (IMHO) bring more realism when used in small doses. You might have to manually adjust the xyz of the teeth, though. (Sorry about not having precise terms, I won't be home to check till Sunday night.)