Some fine tuning of location ....
Still don't have any maps available but looking at your picture compared to mine I'd say it's closer, more looking north up Lewis Channel, say, and the rock could be one of these at the entrance to Teakerne Arm.
To get this shot you'd probably be in your dingy or a kayak though.
Getting close? ... eh???
Haven't been up there for almost 20 years due to the bad experience I had in Laura Cove with a couple Seattle Yacht Club yachts. It was NOT desolate enough. This year, though, it was much, much nicer with probably fewer powerboats than back then.