Hi! By now you probably put your plan into action. When you're generally happy with the shading achieved by the modifier, you could apply it as a starting point. Personally, I define sharp edges while checking the mesh shading, placing UV seams at the same time (unwrapping in Blender). I had another look at the model, so…
Also, you need more empty space between uvs. This prevents shading errors, because it stops it from pulling in the wrong colors from neighboring polygons. In Rizom you have your Padding set to 3, and a 2048 resolution. 3 is not enough space. Examples and explanations: http://wiki.polycount.com/wiki/Edge_padding