To be successful with the kerf cuts you should have tried taking material out of the face of the skirting in this case. Cuts on the back if you had wanted to bend it around the external radius of a corner. Even writing it seems wrong but I had to do it with some 9mm Mdf under a sink recently.
If you had done it the other way you would only have saved lining them up and taping. If you've not skimmed them already you could make a template that matches the skirting profile and run it over your slices.
To be successful with the kerf cuts you should have tried taking material out of the face of the skirting in this case. Cuts on the back if you had wanted to bend it around the external radius of a corner. Even writing it seems wrong but I had to do it with some 9mm Mdf under a sink recently.