I had planned to use my Delta skymiles for our trip in November, but the 25,000 mile flights were either first thing in the morning or late at night, neither one good for travelling with young children. The 50,000 mile flights were at better times, but I don't have enough miles. I ended up booking on SWA for $650 for the 5 of us, which was much cheaper, and easier, than it would have been to get 2 FF tickets and pay for 3 tickets. I will keep saving the skymiles for future travel.
I also found when I first started looking at these flights back in January, that there weren't that many flights available, but when I looked again recently, they'd added more flights for November. So don't despair if there isn't anything very attractive at the 330 day mark. I'd keep checking until you find something workable.