This could very well be a newbie problem using different tools.
I have been a PC since the beginning, but just received a Flex with the new pads and polishes. This weekend I started the correction process on a white MX-5. What I noticed is that the pads left black lint in the polish residue.
Haven't seen any posts to this problem but everyone seems to be doing darker colors, which maybe hiding this. Going to wash them and try again.