Thanks for sharing your info. Based on your numbers, here's what I think happened in your case. (1) received AAA discount (2) gave up AAA discount to use Oct - Dec pkg discount...total savings with this code should have been approximately $525, thus the additional $300 credit you received (3) gave up MYW pkg discount to get
free dining PIN discount. If they had given you the free dining in addition to the MYW pkg discount, your additional savings would have been more...5 Disney adults x $37.99 x 7 nights = $1329.65 instead of $967.
I am pretty certain that the free dining PIN is not only giving you free dining, but also allowing you to book at value season rates even if your dates fall into regular season. For example, if I put your info into the WDW site using value season dates I come up with a total package price of $2721.54 for POR Standard View, 7 nights, and 8-day PH (no dining calculated in, of course). I have priced out several other posters' packages based on this assumption as well and have come to within pennies of their total pkg price each time.
I realize all you probably care about is that you are saving so much money

, but I just wanted to clarify that I don't believe Disney is allowing you to use BOTH the MYW discount and the free dining PIN since that seems to be the impression a lot of people are having.
Hope you have a wonderful trip!