On the CB panel on my boat there is also a cigarette outlet. I believe there is a CB that panel marked for the outlet on that panel. It would make sense if they spliced them together. Open the panel on the front of the helm and see if you can follow the wires from the back of that outlet.
You have to polish when it needs to be polished. You could wax more often to delay the need to polish; but, boats, like ours, living in the water are going to be in the sun. The sun will oxidize the gel coat.
Terrible picture; but, yes. Gelcoat is not thick. Think of it as nail polish. If you polish enough times you will go through it. every time you polish it you are taking off the surface of the gel coat. That is when a boat will get painted.
The anodes have to be in the water to work. The engine anodes on my twin F200's are out of the water when the boat is at rest. With the engines trimmed up there is no part of the engine in the water. What does your f250 look like?
Air circulation has nothing to do with the problem. It has been a well documented problem with F150's. The parts affected are the same on the F200's. It is just luck (or unluck) of the draw.
Some people say it happens because the engines are being overloaded by too much prop. I made sure...
A lot of people do the block off and premix their oil/gas. If you have oil running out the exhaust it's probably safe to lean the oil mixture. What do the plugs look like after running? The best way to check them is to put a brand new set it. Warm the engine up and then do a full power run...
The type "A" side of me says it should be adjusted as the manual says. The none type "A" side of me says "let sleeping dogs lie." If you aren't fouling spark plugs leave it alone. It's been working just fine for at least the five years you have had it.