Wow - your first fuel add? So was Papasierra in Mexico when you bought her? On our Zia, if we fuel at one of the fast pumps, we have to throttle the flow way back or she starts spraying fuel from the vent opening on the transom, so watch out for that.
Interesting about your fuel tank. I was talking with Terry Thatcher about the tank on his 382 Adavida. His was not that dirty either. Mine was so filthy I was shocked. I wonder if they either forgot to clean it out at the factory or if at some point someone was tossing handfuls of dirt in there as sabotage. Other than the holding tank, it was for sure the dirtiest thing on the boat. I should have measured it, but I'm sure I got at least couple of gallon of debris out of there, including (as you said) that fossilized dog poop.
Sounds good on the music!
Looks like you've got radar on Papasierra. Does it work ok? Having a proximity alarm would help me sleep a little better if soloing. But I know plenty of folks who don't have them.