I just read up to your post and thought that I would add this, I know someone probably has said it already but... When you call for an AR, they don't pull up your information and see what you're already doing. At least the worldphiles don't. Simply, unless the CM searches for you specificaly before they do their booking of your AR, they have No clue that you have multiple ressies for dining.
I made p.s./ar for the the last week in June. Then we changed our dates to the second week in June. I called and cancelled all my ars for the last week and made one new p.s. for the 2nd week not quite sure if and when I wanted the rest. When I called back the next day I asked for LTT dinner on the 8th. He said nothing available so I asked him to check the 9th. While he was checking he said, "I see here you already have a p.s. for LTT on the 27th." I said, "I did but I called and cancelled that since we changed our travel dates." He then said all others were cancelled but that one and the one I had gotten the day before for 1900 PF. So he DID know all about what ars I had because he had our resort reservation number.