Gelsomina, Jack and Betsy will give you some of the best advice you'll ever get. With over 150 summits between them, they are old pros - even though Jack didn't bag his first Whitney summit till he was 50 YO. There's a good chance you'll see them again at the Portal in August. They live in San Diego, but try to hit Whitney for extended periods 3-4 times each summer. As I recall, they've been at the Portal in mid-July and mid-August the past two years.
Coupl'a other thoughts:
On the sunscreen, be sure to lather up areas you might not normally - inside your ears and even the interior of your nostrils. Even with a wide-brimmed hat, sunburn from reflection off the granite is quite common. Mouth-breathers have even been known to get the inside of their mouth fried. Also, the sunglasses should be good quality, with wrap-around frames. You want to reduce reflection from the side - not a big deal when you're tooling along the freeway, but something to pay attention to at high elevation. You don't need to spend $250 on high-end mountaineering glasses, just a good UV-factor sport set with side protection. $40 at REI.
Your detailed itinerary is great, but is missing a couple of important details. That familiarization day at the Portal has to include one of Doug's monster pancakes or one of his massive burgers - or, preferably, both. This is the essence of the Whitney Portal experience and you don't want to miss it! Personally, my favorite Whitney Trail food is one of Doug's pancakes torn up and placed in a bunch of baggies. Easy to munch as you walk, with complex and simple carbs both. And still damn good at 14K'.
One other tip for the Portal: take a few minutes and walk over past the pond to the stream and waterfall. Climb up the right side of the waterfall till the parking lot is out of your view and just sit down and soak it in. My wife calls this spot her Happy Place. Betsy's actually the one who initially showed it to her, and it's become mandatory for her to go off alone and spend time there each trip to the Portal. Soul Food. Just don't go too far up - this route is known as Dietz's Folly and should only be attempted by professionals (sorry Tom, couldn't resist).
