Hi, fisrt of all, thanks for that incredible addon. 
I'm doing overclock in mi rpi2 with libreelec for a smooth play with n64 and psp roms in gamerstarter. This is my config.txt
I don't sure is correct, any suggestion or change that I must do? It's the first time I do overclock in rpi.
With it, I can play good to n64 and psp, with some issue of sound, but withouth problem.