First I would like to welcome you to the XF owners community. This is a great bunch of guys with a wide breadth of experiences to draw on. About the only help I can offer at this time is seeing your in the area of high salty humidity, I would not use a car cover as the cover may trap corrosive compounds on and in your vehicle in the covered auto area you live in. With that said, I'll let others jump in on the other concerns you have in this post.