The discussion of how best to attack the runway needs some qualified input. The angle selected was to deny minimum clear width for operational use by fast jets and that was a straightforward geometric solution determined by stick spacing at the minimum permitted release interval for the weapon and aircraft.
In the case of the Vulcans' first raid it was unfortunate that the along track error was so great that only the first bomb in the stick hit the far side of the runway but it did do considerable damage as has already been mentioned.
One should not detract from the skills and determination involved in this mission even though the runway was not cut as hoped - it was always calculated that the over target requirement to achieve a high probability of success was way more than the resources available. Just be content that an effort was made using equipment and personnel who would otherwise have been unable to do anything useful and they actually achieved something worthwhile in this conflict and in the process showed determination and resourcefulness that we should be proud of. I cannot believe that the Argies were not gobsmacked to find that they were vulnerable to attack from heavy bombers from Ascension Island.