There is a section of this wiki article that I did, that explains how to load your nvidia-settings on a reboot.
Now that you have exited the program, you should have a file in /root called
This is the file we will load along with lmce_launch_manager.sh on boot, or reboot.
Now it is time to get this file to load persitantly on all reboots, and boots.
Again as user root:
You will see a line in there:
Before this line add the line:
/usr/bin/nvidia-settings --load-config-only &
This will invoke nvidia-settings to load your newly configured "nvidia-settings-rc"
There is probably a cleaner way to do this, but it is how I have been doing it since I started using LMCE. I am sure there is a way to add it to rc.local, as a script. If you google adding startup scripts to kde, you may find some good info. But the above has worked for me in the past. Also very helpful for properly setting overscan and such.