train my dog so that he respects me

We have an epileptic, extremely hyper, active, strong and stubborn (as well as intelligent) German Shepard cross. He’s about a year and ahalf and we’ve been using the methods of the monks of new skete since we first got him but he is still hopeless at heeling, very bad with staying and tends to growl at us ( not very agressively, but it goes on and on) when we put him into the submissive pose after he’s done something inappropriate. This behavior has worsened over the past six months and he becomes more agressive when we put him in his crate for bad behavior. I think we both need to show firmer leadership, and be even more consistent. I will update you.