In reference to points 3 & 4, if you spend any of your days at the water parks (where there are no FP), those are great nights to use a FP+ for Wishes, Electric Parade, Illuminations, Fantasmic. You can just make a quick evening Hop to see one of the shows and do two other major attractions with your 3 FPs.

Fastpass+ is just ridiculous. The worst part about it is that only those staying at the resort can reserve them 180 days in advance while AP holders are stuck. That's why I've never been able to get a fastpass for Anna and Elsa or dwarf mine car, or toy story. And while it's nice to say that it's essential to get a FP within your area that is no longer the case. You are up to the whim of the system as to which FP you can get. So it is nearly impossible to not criss cross the park which is especially annoying in some of the parks where the bigger attractions are spread out (Animal Kingdom I'm looking at you!). But this may be just a sign of the parks just being a whole lot busier than they were 5-10 years ago.

You can also use your kids fast pass if they decide not to ride. I got to ride Tower of Terror twice in a row because my son didn't wanna ride it when he seen how tall it was lol.

Plan plan plan -- there is no longer the word "spontaneity" in the Disney lexicon.

As long as your willing to ride seperate, you never need a fastpass for Test Track. We just jump in the single rider lane and are riding in 5 minutes or less even there's 60+ minutes for standby. We use the fastpass for Soarin'.