Just a few of my opinions:
The fuzz isn't a concern unless it had very descernable chunks, or flakes of metal on it. Notmal wear and tear, along with break-in will create very small fuzzy particles that nicely stick to the magnetic pick-up.
The different color of your oils mean nothing. They have different colors so I wouldn't worry about that.
I would bet that it was just your time. It seems like you did all the correct maintenance, so I wouldn't blame yourself.