Just dive bomb in the 'true' fashion.
Fly over target, observe the target by banking a little bit, and then, roll over 180 degrees, pull stick and go into a split-S.. dive at 70~80 degrees angle - you can confirm the angle by looking out the window. In this angle, all you have to do is put the target directly at your gunsight, and it will hit.
At first, this method actually seems harder than the method where you observe the target, push the stick forward and enter 0G or -G to set up the bomb run. But after a bit of practice, you'll soon realize that this method is a lot more efficient, safe and accurate as well.
The aiming process is far easier - just Split-S over target, aim target at gunsight center, and then fire. Also, if the initial dive angle is correct(which, can be assured through a bit of practice), you don't have to wait for the plane to dive down long.. just a couple of thousand feet dive is enough - no excessive speed caught, not much alt loss, and no need to worry about ack.