All you can do is experiment, all the commercial rubs seem a bit heavy on the salt to me. There are some that do have low and no salt options, I'm not sure if Plowboys offers those or not.
But then sometimes good ol' salt, pepper and garlic does the trick.
Keep trying different mixes and have fun with it.
Weber Performer with rotisserie ring, 22.5OTS, Maverick 732, Weber Smokey Joe,PBC Smokenator/Hoovergrill, variety of microbrews, Gin and tonic, variety of lighters.