Training on fox only helps a ton. If you can leave them out that also helps as they’ll develop hunt and homing skills. If you have an old dog that will produce game by itself, train them with that hound until the pups are outrunning him. Then start carrying them by themselves and make them hunt for game. Pens full of game and turnouts on sight don’t make them hunt for game. With time you’ll start to notice which pups strike and hunt best and which ones **** their head and listen. My advice is feed the strike dogs and cull the head****ers and you’ll have what you are looking for.