Hi! Just back from a trip over F&W, Jersey Week, F&W Marathon trip. Very busy. I could never find Trattoria before we went. I searched daily while there and just about everything available 1 or 2 days before as people change their plans. I saw lots of PPO breakfasts, BOG, Trattoria, etc. I would just keep what you have, keep the slot open, and start looking 4 days before you need it. Cinderella's Castle, everything. So much so that we've decided next trip we are not even going to make reservations until we get down there unless we need a specific time on a specific day. We had Yak and Yeti reservations, and used our preferred Landrys membership to walk in and move it up to a better time, even though it was crowded. $25.00 for the membership, $25.00 credit towards our meal, plus a visit from the manager to introduce herself and make sure we were satisfied with everything.
Don't worry; whatever you want, it's pretty sure you will at least find something close to what you want. We were a party of 6.
ETA: I used TP reservation finder and lost out to someone else every time (prior to the trip). Also add: we found PPOs and BOG many times before the Trattoria popped up. There were at least 2 Trattorias per day that showed up, too.
Also ETA: A bonus! If it's going to be someone's birthday month when you are going put the Landrys membership in their name and you get an additional $25.00 credit. 99.9% of the time you can't use both, but we also went to T Rex and used the 2nd $25.00 there.