What version of Max?  I have 2010, and I know it has a Poser preset for the GW obj exporter.  Or maybe the preset is in the exporter. I don't know, come to think of it.  The exporter is a free download if you search for it.  Anyway, it automatically corrects alignment, grouping, (mostly) sizing, and has options to bake textures as well as export the textures as well.  It isn't perfect, but may fix your problem.