Time to Replace?
This is how the RA pad looks under sunlight. Note how it is translucent and there's clear evidence of pressure marks over time.
Even though the pad was completely dry, I still think this is a major culprit for the slippage I'm seeing in RA.
I swapped it with the DEC pad which didn't have this look. It was also a thicker pad!
Update: After doing this change, I ran the mount last night and was disappointed to see that nothing really changed.
Will try again and see what I find.