Make the Rockets hit in a Wide circle area randomly, So its good at saturating areas but not at wiping entire defense lines because it can fire in straight lines, and then it couldnt also retreat path wipe that is always been bs to begin with as on most maps its super predictable.
Retreat path wipes are only when you blob at lot, and mostly in teamgames. Making stuka scatter would make it even more deadly because when you see the first 2 shells, you can guess where the rest land. Scatter would make it downright OP considering it has huge AOE, high damage. Imagine bombarding the enemy lines with such a nukeworthy weapon.