Geo-Grafting and custom morphs

bwise1701

So I have created a geo-graft for part of a character's torso so I can up-res the mesh in that area and sculpt so hi-res details. So far so good, I can graft the part on and it follows along with joint posing well and obeys all the shaping morphs I dial in - EXCEPT - for the custom Zbrush morphs I've created. When I dial those in it's as if the geo-graft can't see them at all.

Is there some reason why that I'm unaware of? (obviously)

thanks