Amex has agreed to "reage" which i believe means remove delinquent reporting. I don' t know how long it will take but I'll keep you posted.
Always set up your accounts with automatic payments for, at least, minimum each month. I have all my accounts set to pay automatically. I just log into my accounts and pay down myself, but if something were to happen to me and I could not make a payment that month (in the hospital, etc), I know that all my accounts will pay automatically so I don't have to ever worry about lates. It is a fail safe. Luckily, Amex worked with you but not all creditors will. Setting up automatic payments is a good fallback for the unforseeable. If you had set them up, then the payment on the $8 would have already been made and nothing would have hit your credit report.