Config.plist not saving a change?!

Hello all. I have hackintoshed an old Acer Aspire and in the graphics settings on Clover Configurator, I have to inject my custom EDID to make the ATI Radeon HD 5650 work. However, every time I start the machine up, the "Inject EDID" option is unchecked so I have to go to the graphics injector menu on Clover to check it, then I can boot with full QE/CI support. I tried saving the config.plist to the USB and the HDD and the same problem happens. Any help please?
Thanks.