That was us yesterday! Really sucked....took 4 hours to cobble together an ok lineup....but didnt get SDD or Mine Train!!!
Keep going back and looking. I mentioned earlier that we have AP's and because of that I can look out 30 days for FP+ any time I want to and at least through most of August that I can see in that window there is one available for Seven Dwarfs. FOP never has any at thirty days. SDD and Alien Whirl are full but at 30 days every thing else was available. Now since September is Food and Wine it may not be the same, but I think things do pop up all the time and you just need to keep checking.
Good Luck!