Well................I really like to eat fish, pretty much any species. We kept a couple grayling to eat in northern Yukon (near Keno City) and they were pretty blah. Met a conservation officer a day or two later who was going through town on a survey trip or something and asked him about eating grayling. He said, if it is from really cold water and eaten immediately, it's good. Otherwise, nope.
I would try eating them again, under those conditions. I don't recall what lures we were using, but there was a chance that a twenty pound inconnu could take your bait, now THAT would be a hoot!
Doug