Salt caught fish, proper salty, not an estuary hanger outer.... season it however you want. Or don't. Cook it perfectly and it doesn't much matter.
Scale that thing and leave the skin on. Believe in the fish you caught!! 99% of dry salmon issues are caused or exacerbated by removing the skin. Fill a sink, dunk the beheaded salmonid in there and let fly with the scaler of choice. Work quickly and use ice if your tap isn't frosty.
Portion it from there however you like. If you want to grill it, get it hot as shit, put the skin side down for 3-4 mins and dump the coals out somehow and cover. You might get juicy salmon, but personally I'm done grilling it.
Instead.
Get a seasoned cast iron going on medium heat and let it ride for a bit. Build a nice even heat there, put in minimal oil and take your salmon filet, skin down, and firmly press it into your pan. Let that skin get crispy without burning it, 3-5 minutes on that medium flame depending on your filet thickness.
If you knocked a nice nookie, you preheated your oven to 450 and you slide that cast iron right in there, no flipping of the filet. 2-4 minutes depending on thickness, give it a check. Is the filet opaque across its center, but still clearly raw?
Perfect. Pull it out, turn your burner to hot as shit and flip the flesh (presentation) side down. Throw in a fat pat of butter and some thyme and baste your crispy skin. Give it about one minute, then kill the heat and rest it in the pan to your desired doneness.
Sockeye and coho likely don't need the oven part of the equation. Nor does a Chinook filet that isn't an inch thick or so. Those can just be flipped in the pan once the skin is crisped.
I haven't met the grill that's hot enough to properly cook salmon consistently.
Chef Nighty