Your airspeed is probably not stable, and if your alt and drop alt are more than 2-3 feet apart, you're not going to hit anything.
What i usually do is, line up on the target about 25-50miles out, go to full throttle(no worry about bumping the throttle) and open bay doors. In the pizza map, there is a 30mph wind out of the west, so bombing w to e, or e to w is much simpler if you're over 14000feet, if you're under 14000 feet, you dont need to worry about wind. Wait untill your speed COMPLETELY levels out, a small change will completly throw off the bombing.
Once your target comes in at the edge of your sight, Calibrate on a spot just below and ahead of your plane(Do NOT start the point off to the side, or it will throw the aim off). Hold the mark for as long as possible, 10-20 seconds. The longer the distance, the less a small error will affect it.
At this point, your target should be close to your vertical line in the bombsight, when turning at this point, do NOT turn except in the bombsight, or your altitide and speed will get screwed up. If your speed and alt is stable, and you did a good calibration, you should be able to pick off individual hangars, with minimal bombs.
The key is to, calibrate at the last second, and over a period of 10seconds+, after having flown straight in level flight for long enough for your speed to completely even out. A proper lineup and calibration will give you almost laser guided accuracy, but even a small error will put the bombs a hundred yards or more off.
One tip:
Offline, turn on the divebomb sight. From f6, you will see the cross, exactly where the old precision bombsight would have been. You can compare the location of that sight, to your calibrated sight to see how your calibration came out, without having to drop any bombs.
