Basic workflow + problem with retopology and UV

No, my alignment is great and I´m fully satisfied with model. I just have to work with those models in 3Dsmax, so I need low poly model, but I lose too much quality with decimation. Thats why I need perfect maps like a normals, diffuse and displace and I also need maps in bigger pieces not like on thousands pieces like a RC do:).

I post a few picture, with
Highpoly mesh
30M high poly mesh
low poly mesh with projected diffuse texture (the texture is blurry here)
and diffuse map (there is also visible blurry texture)