I was just perusing other threads about Cap One and CLIs.
In this one, http://ficoforums.myfico.com/t5/Credit-Cards/Capital-One-and-CLI/td-p/4991969 ,
there is an opinion by many that Cap One likes to see high usage of their cards, in order to get upgrades and CLI's. There are some reports of more frequent increases than people usually typically complain about regarding Cap One, by focusing on using the card heavily, in the few months before you try for a CLI.