Set the foreskin morph to .760 and export the involved actors as OBj with only include existing groups in polygon groups checked. Before doing so make sure all rotations and other morphs are 0 in the conformer. This will bake 0.760 as full strength value 1 when you load as fbm via figure: load fbm on the conformer.

Recreate your dependency.

Or you can simply recreate the dependency but this time set the foreskin at 0.760, head at 1, master at 1. This doesn't account your 2 value on head size though. You should have all your morphs operate default max 1 really. You could bake out the result at 2 as a returning 1 as described above though. By having all these differing values as default natural you're making things unnecessarily complicated.