I've spent quite awhile trying to get a good print out of the Na2 palladium/platinum method. All unsuccessful, even generating a proper tone curve adjustment proved too challenging for me. I switched to a straight platinum printing method and did a quick test print last night with a normal chemical mix for two and half minutes in my plate burner. I was surprised to get such a successful print!
I also tried adjusting the chemical mixture a little and a double coating the paper, this one didn't work out, but the image holds some promise to me.