First off all, there is no way I can get these uvmapps to run any straiter. I supose you know that already by examing how strait the lines are on the uvmap. The distortions are caused by the narrowing of the mesh. I havn't have any experience with this mind you, but what I have picked up is , you can do it with 3d painting software such as Deep Paint. It allows you to paint directly on the figure. I have read where some users 3D paint software say they don't care how the map is layed out, they can do exactly what they want with it. I am sure there is a demo out there of Deep Paint.