I know this was dealt with to your satisfaction some time ago but I have found a total solution if you are making your own missions. I tried the ini. fix but it did not make a great difference. It is great to have massed B-52 strikes but I have found that with anything more than two ships, the following bombers in a flight of 4 or more spray their ordnance all over North Vietnam. They drop their bombloads at the same time as the lead aircraft. Also, with the wild roll in the aircraft, the bombs come down randomly across miles of real estate.
I have set up a nine ship attack in three cells of three. I set them up as single aircraft US bomber 'formations' in KMD, then clone the first aircraft twice, then have them take off 20 seconds apart (15 would probably be better but I have not tried that yet). This also gets them off the ground quicker than a multi-aircraft flight setup of 4 or 8 bombers. I then adjust the flight paths so that they are very, very slightly separated. That way, each aircraft flies straight and level but in 'formation' and bombs the target right on the money. To get a good spread of bombs, I adjusted the objective point slightly for each aircraft for an airfield attack during Linebacker II - one on the runway, one on the main hangar, one on the windsock, etc. Otherwise they literally bomb the same craters as the preceding aircraft. The rain of fire on the airfield was fantastic to watch from my escorting Wild Weasel F-105G. The lead aircraft walked 24 bombs across the field, lighting the fuel tanks. They made a great aiming point for the follow-up cells.
It is a bit finicky initiallyt but you quickly get the hang of it and the results are definitely worth it in terms of immersion! The Buffs experienced few problems with SAMs as the WW flights kept them busy.