I didnt  know something broke. Noone told me, and noone replies to my Pml mails anymore anyway :)

If GOZ morphs in posed geometry, then they might have solved that problem. I am not 100% sure but I remember that using old poser export included morph targets when you export, even if asmorphtarget is enabled, and even in zero position it could happen that some JCMs were slightly active, e.g.  Because of IK dependency or such, and upon loading the morph target that would accumulate, yes.

no idea about goz. Eitherway, I think symmetry is always a pain, especially if the figure you work on is not symmetrical in the beginning. For daz4, i think they load with a small rotation of the hip, and morphing them posed might be difficult in a modeller.

during testing, I used the wireframe view and loaded the morphed obj and the morphed figure to see if they overlap or have differences. Its quite useful for testing.