The trick I had to do with PLH was to take the original .obj into my modeling program, export it unmodified, then make my mods to the mesh and export it again. Then use PLH to compare those two exports (the before and after). That worked fine. The first time I tried it I fed it the original .obj and my modified one from my modeler and because there was some difference in the accuracy of the .obj it made morphs for virtually every virtex in the mesh. But by exporting an unmodified copy to use as the base then both meshes had the same obj accuracy and PLH just made morphs based on what had actually been changed between the two, as it was supposed to. (I hope I explained that right)