Can’t help with a tracker but to help facilitate the return of a dog to a command, pref Acme dog whistle rather than shouting as it travels further which you need with hounds 😉 buy tins of cheap hot dogs, cut into cubes and train the hell out of it so that every time it comes to your whistle it gets a treat.
Then take this training from the house/garden to outside. The hot dogs (cheese is another good option) are high value treats that a dog will want to return to. Trying it with biscuits or some other low value treat doesn’t have quite the same effect.
You need something that the dog wants more than running off for an explore/chase.
Sorry if you’ve already tried all this.