The Service Centers indicate that once your particular process date is current in accordance with their posted process date on the internet, you have to wait 30 more days, in order for your case to be "outside" of the normal process time frame. Then you have the right to inquire and maybe push your case through. However, what they don't says is, it's also possible for them to roll back the process date the following month, so 30 days after your case has gone "beyound" their processing time, just as when you think you are eligible to start pushing on your case, it becomes "within" processing time again. These dates are useless, they only use it to their advantage.
