Forget german 3D shoots: as hunting practice it is totally useless, but the stones in Kirchberg are fun....
Hunting practice is guided by the hunting method you'll use. That means shoot from a treestand, groundblind or from the ground in similar conditions as your hunt will be at hunting distances. Use the same quiver, not a seperate target quiver. Use your hunting quiver and your hunting clothes if feasible. This doesn't need to be camo....
The timing aspect is overlooked by most archers not used to bowhunt. Bad timing can cost you a lot of good shooting possibilities at game. Don't ask me how I know that..
This is best trained with another guy giving you different stories about what happens with your intended target (3D or animal silhouette doesn't matter, but silhouette is cheaper). The narrative will force you to shoot at a specific time.
For example elk hunting: Shots are often under 10 yards in the black timber, but need to happen within seconds, because the elk are moving through. So this is the time for automatic "quick shooting", not time to think.
Think about this Mr. Grubenreiner...