Hi all (sorry for my bad english but i'm italian =D)
I've find a solution for "low texture resolution" after the compiling of our maps in "Rage Tool Kit".

When you go to build menu select:
Build > Build Wizard
In the "Build presets" select "Full Map Build + Mega Bake [Default]"
Now go in "Advanced" tab, uncheck "Build Unique" and select "Build detail"
Now press "Build".

Enjoy!

Thanx!!!!!

It would be nice to know what the difference between the two options is.