I know this question wasn't directed at me, but wanted to throw in my 2 cents!

As a general rule, I feel you can usually accomplish a lot at RD in any park, without the use of FP. I generally reserve my selections for late morning / early evening when the crowds are heaviest. So in the interest of park hopping, I would generally recommend saving your selections for the 2nd park. However, 3 caveats here: Not sure if the 3 scenarios you laid out are your only park days or not, but if you are only going to be in HS and/or AK once, then you may want to schedule FPs there as to ensure you get on the rides you want in those parks. Second, MK generally has the most availability for FPs later in the day, so the day you hop to MK, you can likely utilize your 4th, 5th, etc. FP options with relative ease. Third, if there is something your or another member of your family absolutely HAS TO DO, throw all logic to the wind and schedule it for whatever time you can get!!! In my family's case, this was the A&E M&G, which you will thankfully avoid! But better to "waste " a FP and accomplish what everyone really wants to do than to have to skip something because the line is too long. Hope that helps!