From your XFree86.9.log:
(**) | |-->Device "STB nvidia 128"
This doesn't match any entry of your XF86Config.test-4 which, BTW, seems totally bogus. No "EndSection" for the Monitor section, two Device sections with the same Identifier, no Screen section, ... Did you post it without any editing?
Also, why is your xserver log file named XFree86.9.log? Is this the only file named XFree86.* in /var/log and does its modification time match the time at which you started the xserver?