This seems as good a place to post my recent experience as any. I applied for a CSR a month ago. Before applying, I called and asked for a reduction in credit limit on my CFU. In my mind, I was making space for them to approve the new card. The CSR was pending and they called to verify my income, then approved the card. I got a letter a couple weeks later that said I was approved (already had the card in hand) and that they had adjusted my two other cards (CFU and Marriott Rewards Plus). They basically took the CSR credit limit from the Marriott card and also showed my requested decrease on my CFU card. The lesson I took from this is not to reduce the limit prior to applying for a new card, but instead let them make the determination where to re-allocate the credit limit. I still have plenty of credit, but, in the end, I am down the amount of the requested decrease.