Sorry for the late response to people's questions but I forgot to check the box to get notified when someone posts
here is some more data points for everyone
No HP
I have had this card for 18 months now starting CL was 3500 I believe
My first CLI was after 2 or 3 months (I don't remember which)
I did request a CLI every month until it got over 10k (this happened during the first yeat) then I stopped because I have plenty of credit. Most of the time got a lovely denial letter in the mail from the requests.
The only pattern I have observed was those months where I made 1 large payment instead of 2 (I get paid twice a month) I was more likely to get a cli (but not always).
Hope that helps someone