XConfigurator doesn't know nvidia
If you run XConfigurator, you will notice that your XF86Config file is created as before.
You need to change "nv" to "nvidia" , adding Load "glx", delete Load "dri" , Load "GLcore" and customize your options.
In RedHat, XConfigurator doesn't do this.
It use "nv" driver, or "vesa" driver. Never "nvidia".
I don't know any program or script that make this job for us.
backup your XF86Config file before running XConfigurator, and then, modify it manually.