You need to save the the new kernels for the script;

In xterm:

sudo kernel-config load lv <enter>

sudo kernel-config limits 250 805 <enter>

sudo kernel-config save lv8 <enter>

And then you have the first one. If you want other values just type the ones you want, but still save the file as dscobsct named the .desktop files, then you don't have to change them aswell, if don't save them under the same name as dscobsct it won't work

For the other one just load ulv and set limits and then save as ulv59 Should do the trick...