I just recieved an auto CLI via email from discover, they gave me $600 for "overall excellent credit management." I just got off the phone 15 mins ago with a nice rep whom I asked if its possible to get a little bit more increase, so that I can utilize the card more for more frequent purchases without worrying about the credit limit. She took less than a minute to ask for my info and another 30 seconds and was approved an additional $1500. Soft Pull. You should be able to call them and ask an increase, and they'll let you know first if you'll have to authorize a hard pull or not. Good luck!
