Interesting looking at the different techniques. All similar but different.
Technique for a hangar in a P51D (favourite Jabo ride)
salvo set to 6 and rockets selected
I come in at anywhere from 10 - 15k (15k takes a little more speed management on the dive)
Commence approx 45 degree dive and throttle back
I control speed to around 450mph
At about 2k I fire rockets aiming at the top of the roof line for the hangar
I hit back space twice to select bombs and dip the nose so I'm aiming at the base of the hangar where it meets the ground
I release bombs (time between rocket release and bomb release is probably less than a second).
Pull nose level take evasive manoeuvres if needed then hit wep and start climbing.
99.9% of the time the hangar is down and you are back up around 7k to start a fight with any nme cons. If a lot of cons around don't bother climbing just hit the deck and run as fast as you can

Cheers Kiwi