The best thing about Universal is that you don't have to pre-plan all meals out. It is so nice to just tour the parks and when you are hungry then stop where it is close. You have made solid choices so if it all works out stick with those, however if you find that you are at the other side of the Universe from those places when your hungry here are some other options to consider.
LUNCH: IOA Three Broomsticks, we eat a late breakfast there, because the full English Breakfast fills me up until dinner. There lunch menu is pretty good as well, limited though. The last time I ate at Mythos for lunch, it was just meh, I think they may have backslide a bit, but they do have a good selection.
CITYWALK: While Cowfish is amazing, look at the menu before going, it is not for everyone. Very unique, however if you have a picky eater, this is not the place. If NBC is open for lunch, it is a solid choice, but I don't think it is always open for lunch.
US: I did not enjoy the Krusty Burger at the Food Court area in the Simpsons, however I did have the taco at Bumble Bee's and it was pretty good.
DINNER: for IOA nothing comes to mind, US, the only three places I eat for dinner are: Finnegans, Lombards and Leaky Cauldron. I have tried the quick service places all of them and was not impressed with any of them, just standard fast food and blah Italian food. CITYWALK: Dinner has so many great choices you really can't go wrong. Just stay away from Bubba Gump's, stay far away. They could not even tell me where they get there shrimp from, even after our server went to ask the cook. The response from the kitchen is, we get our shrimp from the USA and overseas, but I don't know which shrimp go into which dish.