[{HVY-E}Jinxx]

Instead of using the "Set" function for there target, set a waypoint at 2000-3000m alt about 5km before the target, then set another waypoint designated as "Ground Attack" and place it right over the target you want hit. Do not use the "Set" function.

That should get them hitting the mark.

After the attack make the next waypoint at an alt of 500m and about 10km from the attack target.

Try to keep all three of those waypoints in a fairly straight line.