I’m also not sure it’s about scores. When I was approved for my QS a few years ago the score they pulled was 648. They started me at 5k. I just got a 3k increase last month ( I pc’d it to a Savor last year)after not requesting a CLI for about two years, so my limit is now at 24k. You are putting 3k through a month, so that sucks that you got such a little increase. That’s in the ballpark of how much spend my card gets.
When I started my credit repair a couple of years ago (in my sig line you can see when it was - just look for the sub-600 scores) Cap1 was my only card, and it was a Secured card with a $500 limit. They wopuld not let me add more funds to it to increase my limit. After a year they graduated me to an unsecured card and returned my savings account balance. Six months later I asked about a CLI. I got one - from $500 to $529. By that time I had an Amex with a $4,000 CL and was soon to get my 3x CLI, which I got. At that point I really did not need Cap1 and Cap 1 told me in every language they knew that they were not going to help me increase my scores and in fact would hinder me with such small CLIs. I told them to close the account and have not had a Cap1 since, nor will I ever consider one.