Exporting indivudual bone scales is no good.  Even if you got the exact shape exported perfectly, when you re-import it, the bone scale from the rig is re-applied to the same geometry - so the deformation from scaling the bone is applied twice.

A4 is simply a morph of the base V4 OBJ.  Your problem is that, if you want to distribute your newly created morphs, you cannot include the A4 morph - which means, if you make some morphs in Zbrush, then once you have them where you want them (assuming you fix your scaling problem) you must subtract out the DAZ morph(s) used:

• Bring your combined morph into Poser and load onto V4
• Inject any DAZ morphs used
• Dial them to -1 ... hope you weren't using any bone scales, because they'll cause a problem here too.

What is left should be just your own deltas, which you can then spawn new morph targets for, and redistribute (probably as INJ/REM files).

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