Baking Errors

I'm having some really weird artifacts when I try to bake the high poly mesh onto my low poly. I've tried everything I can think of. All the normals are facing the right way, no overlaps on UVs, the low poly is softened, I've used the cleanup tool to get rid of any weird geometry, I've tweaked and retweaked all the baking settings in substance but I'm still not getting anywhere. I've attached some screenshots of the model both in Maya and substance. Any ideas?