Thanks for the feedback and suggestions. I will keep that in mind.
Jefkorn,
I would wait 3 weeks away from the deadline and call the AUSA. You could tell her that you understand that the AUSA has multiple cases to handle and don't want to increase her workload. However, it has been real difficult for you and your family because the USCIS doesn't do their job properly. You can tell her that you could dismiss this case if the AUSA can push the USCIS to adjudicate your cases timely.
If the AUSA ask for extension, I would give 30 day extension. After that, I won't agree with any extension if your applications aren't adjudicated. If you are very anxious, then negoniate the time to 2 weeks and oppose it after the first extension.
I would say you should be polite and firm on your standing to AUSA.