In any case, I think you would not have promoted, because only 1 team per conference can grab the auto promotion slots.
I actually think your record in the end will be sufficient to get to the auto promotion threshold, because some of the teams with higher records will win their divs. However, as a second-place team in the conference they wouldn't promote you. (So e.g. if I had had your record I would have had a strong chance of auto-promotion.)