I have only used the factory supplied white polishing head with microfiber bonnets over it. Never thought it was that nice in comparision to Lake Country and Edge offerings.
Would not use the Porter Cable pad for anything but throwing a bonnet over. It's not Lake Country quality and I do not recommend it. As for the counter weights, we have not seen any real difference in using the 6" versus the 5" counter weight. I use both backing plates and I never change my C.W.