If you are soaking the bird in a brine, there is no reason to inject it. Don't believe in injecting anything unless you are deep frying it.
i understand; however, i've done it both ways. it seemed the moisture and flavor was a bit better with the injected bird. i failed to mention i'll include melted butter in the injected solution.
also, i've used a dry rub on whole chicken. perhaps instead of injecting i'll rub it.
the other thing i'm going to try differently is to separate, carefully, the skin from the meat. trying to leave as much skin on as possible. i've also stuffed the bird with oranges, but it came out bitter.