I'm going to respond to each installment in parts, because by the time I get through everything, I totally forget what I wanted to say.
My only hesitation about the Narcoosee's ressie is that it's so late. I know you're young and way hipper than me and my husband with our one soon to be two kids

but having that early ressie at the Crystal Palace (which I love, btw) and then the late dinner just wigs me out, and that's totally personal preference.
As far as getting to the Grand Flo, if you're in the MK, it's not big deal. And I wouldn't worry about "dressing" for dinner. Ask me about the fluke time I ate at Citrico's unexpectedly and what I was wearing then. Trust me, they're not going to turn you away. Sure, it's nice to get dressed up, but you can even do casual dressed up with no issue.
As far as the food there, it's been a long time since I've eaten there. I certainly liked it, but I've never made a point to go back. For me, there are other signatures that I prefer, and that's what I stick with. I will admit, I am totally a creature of habit.