I tend to leave a little more fat cap than the picture illustrates. As Kapn said it depends on the cooker. I cook on a Stump's where all the heat comes from the bottom so I feel that a little more fat helps keep the bottom from drying out. Yes, fat side down for me!
I do also reseason about halfway through my cooking time.
Weber WSM and Kettle
7' X 14' enclosed trailer
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