I always lower to $5k before I even receive the card, because they always give something silly like $18k or $12k. Lower to $200 (the absolute minimum allowed) after your bonus has posted in your AS account and you have paid the card off in full (obviously after the $75 fee and $100 credit).

HUCA and get someone to do it. Heard it probably once. Hang up call again and they will usually do it. Then they will give you some BS like the CL decrease will change the card to the platinum version. Well it doesn't, and even if it does, you already have the 30,000 so the card is just awaiting cancellation anyways. In the past, this is when I would just straight up cancel the card and reapply, sometimes right after the first eBill date, but now it is WAY harder to get approved. So just hold on to it for a while and let it age.