Yah I did the subdivision, that was the first thing I thought of since I know it solves the issue most times.  Set posers texture filtering to None.

Could just be the sets I'm trying to convert,   Using some not so basic skin / fur sets. Parrotdolphins Okapi ... Doc000 Feeloo, Sileena, Ixia & Ankahnara ... so there is a lot of patterning making the seams more visable..  Also the original textures themselves may not had a lot of feathering(?) at the seam junctions.

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Consider me insane if you wish, but is your reality any better?