The way you're tracking the credit card will results in all sorts of confusion and isn't right from an accounting perspective either.
Instead of using Accounts Payable, create a Credit Card account on your chart of accounts and enter the charges there, much like a bank account, only the balance is what you owe instead of what you own.
Then when you make a payment, just write a check from your bank account and use the CC account as the 'expense' account in the detail area of the check. This creates a transfer from your bank account to the CC account, paying it down by however much you pay.
