Is there a reason why you don't want to make V4 legs invisible?  The whole concept that we have to leave every single polygon visible and hope to make two objects mirror each other with the perfect amount of offset to hide one set of polygons that should be hidden is a massive waste of time.  You have to ask yourself what is the final result suppose to be?  If you turn off the visibility of the legs then the poke thru would be gone. In this case the best way to do it is to make a mask to turn off the texture under the sock.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13