A regatta has a fleet of 7 boats racing.  

1.)   The regatta uses the following language in the Sis and NORs “five races scheduled for the regatta”.  
2.)   The regatta includes one throw out if 5 races are run.
3.)   The protest time limit was 30 minutes after the committee boat signaled they were ashore.
4.)   The winds are high during the regatta with all other fleets deciding not to race after the 4th race.

At the end of race 4, Boat C decided to go in for the day with the knowledge that 5th race would be their throw out and their position in the regatta could not change.  At the end of 5 races the scores for the top 4 boats are as follows (I did not include boats 5-7 because places did not change):

Race committee decided to run a 6th race.  Boat C was no longer on the water, the other 6 boats raced the 6th race.  After 6 races the score were:

Boat A moved into first place winning the tie breaker under rule A8.2 and Boat C moved from 3rd to 4th.

The scores were posted about 45 minutes after the committee boat was ashore or 15 minutes after the protest time limit.  The skipper of boat C did not even know a 6th race was run until the scores were posted.  

The skippers of boat A and C talked and the Skipper of boat A decided to ask for redress about 5 minutes after scores were posted.  The organizing authority told him not to bother filling out a form because the time limit had expired.

Questions:

1.)   Should race 6 have been scored?
2.)   For redress, when you do not know if it is needed until after scores are posted, is the protest time limit the correct limit to use for filing.
3.)   Is the time limit different if boat A or Boat C requests redress.  Boat A knew a 6th race was run before the scores were posted, boat C did not.
4.)   How would a redress hearing find for the competitors.