Keep it under 300, if you do go over 300 and are in a strong dive make sure your engines are powerd down.
Opening the bomb bay will also help slow you down a bit. "always"
If you drop in from 2-3k you can get a shot off at a tank easly.
The second your nose starts to get upto the horizon slam it into wep and close the door.
Try to keep it under 3-4g's on pull out or your wings will snap off.
Also helps if you are making a prolonged dive "from 5k+" that you drop speed to 250 - zero power bomb bay open, +1 or 2 flaps.
The second you start to reach 300+ you need to twist and bend thru the air with your rudder, it will slow you down alot.
I never* have a problem while diving on a target, i also have yet to snap a wing off while in combat.
Sometimes if a pullout is to much, dip a wing and apply rudder to the direction you want to go, this takes the force off alot of the planes wings and places that stress on your tail section & body.
Once your nose gets upto the horizon, make your wings flat and start climbing.
These "moves" apply to almost every plane in any high angle high speed dive, of course our b25 just happens to rip apart after 350, and dives like a rock.
"Throws two cents"