Practice in the training arena will help. Understanding how the Optical sights used in the game function for bombing also will help. The sight in the P51D is the best example. It is actually two sights in one, the bulls eye, for centering aircraft and shooting them down. The second sight is the little lines directly under the bulls eye. That portion of the sight is used as the bombing sight.
The P51D sight is the only one I’ve seen , there maybe others available in the game. But you can dive on a target, I like a dive angle between 45 and 60 degrees. Line up the target, as you move in on the target, don’t keep it centered in bulls eye, let it slip down to the lower edges of the sight and press the release. A stabilized approach helps, with speed a constant.
Come fly with the 113th Lucky Strikes as Knights any Saturday night, we do a lot of town busting and have perfected the single pass take down of any hanger. We use the P38L as our primary weapon. Hope this helps.