I'm certain Epervier's fix will work.
I had the same problem, you can set waypoints for level bombing, but this plane acts like an A-20 when it hits the attack waypoint.
my solution was to be the "Lead Bombardier Navigator".
stay in formation to the target all waypoints set to "normal" and all ships ABOVE 1300 meters ALTITUDE according to instructions..line up your bomb site
but use the tab key to command the bombers to "drop on my command" so they release when you do.
i.e. keys : "tab>7>6>8..
set the commands before you get to the target - of course.
This means the learning curve on how to use the tab/command options.
And you have to actually "lead" the mission..which gets crazy.
And they will only be as accurate as you are..but realistically - these missions were a bitch and things would always go wrong..
Sometimes you do all this and still miss the target. That's how it was..
Happy flying