there is actually a way to fix this if you are a little familiar with 3ds max
first load the body parts (head, hair, body)
now look for the Dummy named : Dummy_Hair and align it with the one named Dummy_Face using th align icon in the toolbar . A small window will pop up :
-in align Position(world) check if the x y z position are marked
-set: pivot point for both Current Object and target object.
-finally in the align Orientation (local) mark X,Y,Z axis then apply
you will see that the hair will fit exactlly the position on the head.
now you have to link the dummy_hair with the Dummy_Face by using the select and link icon in the toolbar. this way the dummy_hair will become a child of the dummy_face.
hair=done.
for the head it's actually the same steps as before: align the dummy_neck with the bone Bip01-Neck set the same parameters as above, so the head will fit its place
and finally link both of them, the bone bip01-Neck will become the parent for the dummy_Neck.
now you can load the psa animations for both
enjoy