Second question: a previous thread showed this - Use the templates as a texture. Look at the mesh density on either side of those seams that you mentioned. Figure that it also demostrates the concentration of texture pixels on either side. The neck can be affected by the relative sizes of the Head and Body textures. The others are internal to a single texture and they are all the same material, so you are stuck with a single texture. How to do a texture to minimize this, I leave to others.