Setting CV8 = 8 will reset the decoder to the settings as set in the sound project which is what you want.
It is possible to set the decoder back to the original settings when it left Zimo i.e. prior to the sound project being installed, I wonder if that's what you have done.
CV #8 = “0” NOT recommended (service purp. only) Default values of the CV table
In DecoderPro the factory reset gives 3 options and unfortunately the default is CV8=0, so could you have done this?