<human>: Provide a brief overview of the text.

I've been rebuilding my credit over a long period of time from poor financial choices in college. Because of my income I don't need the credit, but I want to continue to build my credit history in the hope of getting a mortgage in the next year.

About 2 years ago I finally got a annual-fee $250 limit card. Then a year ago I got an additional $500 card from my bank, then upped it to $2K by asking. The $250 card has risen to $750 over that time. Just going slow, up to $2,750.

Last week I was 4 days late on the $250 limit card, first time in years, so in anticipation of a hit to my score I took a shot at applying for and got (!!!!) a $10K airline card (I travel a lot). I was surprised at the size of the limit, which must mean my credit score has gotten a lot better recently. (CreditKarma says its 730/850 "Good").

Should I go ahead and apply for 1 or 2 more cards before the hit and the new credit card appear on my credit report, to increase my available credit limit up to the $20-$30K range, or will acquiring a large amount of credit in a short time be negative? I am not planning on carrying any balances and am good with my money, just wanting to maximize my balance-used to available credit percentage, and maybe for emergencies.
<bot>: Got a big limit card and have a narrow window to get some more, but don't want to kill my score from inquiries.