A little more information re: Dusty's history might help. For example, if Dusty was removed from his mother before 12 weeks, he may not have learned how to play without hurting or biting too hard. Or, if he was a feral cat, he may have trust issues that should be dealt with in another way. Is he neutered? If he isn't, it may be that he's aggressive because he's starting to mature sexually... When does he bite? When you're playing with him? It might be that he's a cat that easily over-stimulated... which is another issue.
So... how old was Dusty when you got him? Under what circumstances did you get him (ie/ was he a stray, a shelter cat, from someone you knew...?)? When does he bite (ie/ when you're playing, if you're rubbing his tummy... etc.)? What type of personality does he have (ie/ shy, confident, bossy etc.)? What types of play games do you engage him in?
Answering these questions will help get you the right kind of advice you need.