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No tricks that I'm aware of. After 4-6 months (it was 6 months for me) you can start hitting the love button. Once you get your first increase then you can usually get one every 3 months or so (sometimes less than 3 months). I always try to use my card before I ask for a CLI, it seems to help get a larger increase compared to if I hadn't used in in months.
Thanks for the advice. CM
In my experience with Comenity cards, you can hit the luv button several times in one sitting to increase your credit line. I have the TR Visa and they raised it by $500 each time I hit the button. Got an increase of $1500 total. VS did it twice in a row for me, $200, for a total increase of $400. I think they'll do it every 4 months.