Wish I had somethin' tested for you, but I don't do fish on my Webers.
I did find an Ivar's copy-cat that sounds pretty (read very) good...

Grilled Salmon with Citrus Butter: This recipe, adapted from a recipe used by Ivar’s Salmon House in Seattle, turned out to be simple, delicious and ideal for Copper River sockeye.

The fish is sprinkled with lemon pepper and salt and then quickly grilled over hot coals with wood smoke.

It’s a classic Northwest recipe, with one added special touch: You baste the fish with citrus butter, which is melted butter mixed with orange, lemon and lime juice. The citrus tang, along with the sweet smell of alder smoke, is what makes the grilled salmon at Ivar’s Salmon House salmon such a Seattle favorite.