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I seem to be on a 60 day cycle with discover. I opened my account in Feb 18. I hit the luv button right after my 2nd statement in April and got a $1500 CLI, I tried again in May and was told "not enough experience with current credit limit", and in June I got another $1500 CLI.
Just because you can ask every 30 days dosen't mean they will give you one every 30 days.
As for me, I got CLI's pretty reliably every 3 months or so for the first 9 months of having my first Discover IT, but since last December the spigot on that card has been turned off. I do seem to remember the occasional phenomenon - not solely a province of Discover - where if you leave a card unused for a few months while keeping it paid off or down, and then try for a CLI, you'll sometimes get a really nice one, possibly as an enticement to get you to start using the card again.
I got my second Discover in March, and tried for my first CLI last weekend. Got a fairly modest one - $500 - but I'll give it another shot at the end of this month under the 30-day-minimum rule reported by OP.
Insuficient experience with current credit limit.
Yes discover does buckets.. but they are usually a bit more accomodating for growth than say Cap One...
Really seems to affect secured cards more than others....
Might be worth apping for a second Disco ....
-J
Fugget about Discover, you have a great lineup already. You could always apply for a Chase Freedom and then get rid of Disco forever. (yes I realize the categories sometimes don't overlap but that's not the point here)
Ah so the CSP must be an AU card then? Could always become an AU on Freedom