Divebombing will take ALOT of practice. Even in a fighter it's hard. Not like AW where a pilot can use the the LCOS gunsight. Generally a shallow, no more than 45deg dive, and aim just a little further beyond your target you want to hit. In the P-38 or Ju-88 you can get to 15-20K, roll over on the target and dive verticly for a brief enough time before you build up too m,uch air speed. But enough time to line up and release. But!! Do not forget the dive brake: [Shift] [C] I beleive is the key combination which will help slow down the build up of airspeed.
-Westy