Help with Sexlab Open Mouth

[fatumex]

I'm trying to change the sexlab expressions pex file so that when my argonian has an open mouth its just a bit bigger. 

 

This Is Ideally what I would like:

 

This expression is obtainable using console: MFG P 1 100

 

 

Below is the default open mouth with the original sslExpressions.pex available from the sexlab mod.

 

 

 

 

When I take literally the source .psc from the sexlab folder and compile it myself it ends up looking like this:

 

 

 

I haven't edited the .psc in any way but every pex that I have compiled comes out looking the same way. 

 

I use Special Edition.