I did the hike in 15 days three years ago, and am considering doing it again this year in a few less days.
Someone asked why 9 days to VVR then 6 to Whitney Portal. I think that's a brilliant pace- though I like Muir Trail Ranch because it's farther South and less of a deviation from the wild nature of the hike. The northern half of the trail has 3 resupply breaks, while the southern half has none. Going SOBO you are just getting your legs, acclimation, and sleeping tuned up. Might as well break in gradually when you don't have to carry much food. The southern half is higher, no easy resupply- but you're hopefully fully acclimated to life on the trail. 6 days' food is a good number to fit into a Garcia bear can without pulverizing everything.
Regarding food- I was carrying about 15 pounds more bodyfat than I would prefer. I found that it was hard to eat more than 2000 calories on the northern half (Though I added restaurant meals at Tuolumne and Red's). Once I hit the southern half I was good for about 3000. I did lose about 7 pounds though.