Taking INTO DARKNESS into consideration the size of 350 meters is about right.
Several hints at that: Kirk and McCoy dive to the Enterprise.
Vengance attacks Enterprise we see several hull breaches, and they consist of one at max two decks at the endge of the saucer.
When the Vengance crashes, it's saucer is not higher than 150 meters, considering it is much bigger than the Enterprise, it will probably be somewhere in 600 meter range.
350 meters fits the ship perfectly, therefor one has to readjust that chart.