How to restore corrupted morph symmetry for Genesis figures in Zbrush or Poser etc?

wargis

Hello! I have a wide-spread problem with broken symmetry of created morphs for Genesis and Gen2 figures. As a noobish amateur, I often forget to turn symmetry on in Zbrush or Hexagon and so some parts of figures come out asymmetrical, especially heads - one ear is bigger than opposite, or one half of face is different from other and so on. If it happens on the left  side and the right one looks nice, there is a simpler way to correct it with Sculptris, (very smart smaller brother of Zbrush) with its Symmetry button, which copies right side to the left. but on the right side or on both sides distortions are harder to correct and I am too lazy to start all the work again. I tried Resym and Smart Resym in Zbrush but I don't know well so far how to use it with masking properly and so this features do not work as supposed. So if I have one complete Genesis of Gen2 head morph with some flaws on the right side, or on the both sides - is there any way to split the head morph and to mirror the left side somehow? I found interesting advice about Poser Split morph function and Zbrush workflow here - http://forum.runtimedna.com/archive/index.php/t-54869.html .
I managed to split one such broken morph for G2F's head in Poser and got one half of G2F's head (left) morphed and another (right) unmorphed. Here is an example of such splitting, where I want to mirror left half to the right  -

Than I exported this half-morphed mesh from Poser (I'm not sure that with right options checked) and loaded it into Zbrush to resym, but Resym and Smart resym just spoil the mesh, not make it symmetrically morphed. I want to transfer position of morphed vertices from the morphed half of the head to the unmorphed vertices. I found this workaround -
If it's a morph that is asymmetrical and runs across the center axis of your sculpt, you can duplicate the model in that state, append it as a sub tool, flip it using the symmetry commands, then transfer that shape upstream to the original model, thus flipping the original shape. If you do that into a new layer, you will have a copy of both the original and the flipped shape that can then be exported for use in Poser.

But I don't know how to perform it in Zbrush step by step, because I'm just started to learn working in Zbrush. And I want to load both mirrored morphs into DS, which refuses to load exported split morphs from Poser because of wrong order of vertices. I found another closer workaround here - flipping a morph for Genesis - http://www.daz3d.com/forums/discussion/14124/who-knows-how-to-flip-a-morph-in-zbrush-not-mirror-please,

but again I don't know how to perform all this trick. So I need help from more experienced users of Zbrush.

Ps. I tried Morph MT tool also, but with Poser-exported split morphs it doesn't work, geometry mismatches. How to split morphs for Genesis figures in Poser and export them correctly to make them work in DAZ Studio? I feel there is a simpler way to do all this but I cannot catch it.