Call and ask for a prequalified limit increase. Tell them that you don't want a hard inquiry on your credit reports because that is detrimental to you FICO score. A lot of times they offer CLI based on your payment history with them.
JUST ASK FOR A "PRE-APPROVED" CREDIT LIMIT INCREASE...(NO CREDIT REPORT) "IF" THEY SAY THEY MUST PULL...IT IS UP TO YOU IF IT IS WORTH THE "HIT" OF <7> POINTS To me it is NOT worth the "HIT"