Hi StillPatient,
I think I can address this a little bit. I've been stuck in the very same boat that you are in. It's about 84 days and change for me since the VSC received the RFE Response for my wife's 485, and I've been peturbed that we haven't seen anything move on that front since August 10th (the date of the last LUD). They did get the response on August 4th and the LUDs changed three times afterwards and stopped on August 10th.
I did research and it seems that the USCIS issued guideline is 60 days for a case to be adjudicated after an RFE response is received. I thought that the other service centers were more proactive in meeting this guideline, as evident by several approvals that I've seen, some from the TSC. Take Brittany for instance (I think she was CSC but not sure).
Also read this link:
http://www.hooyou.com/news/news012706rfe.htm issued earlier this year.
I've always been checking the case status online and never called the National Customer Service number to get case status updates until yesterday. I punched in the EAC number for my wife and the message states that we should expect an adjudication (written notice) within 60 days. That was as of August 4th and it shall be 90 days come November 4th. At this point, I've contacted my attorneys, since they're the ones who are supposed to follow through (not to mention thats what I've paid them for). They haven't done squat yet. After the 90 day period, which you are in, you are free to seek counsel from the AILA liaison. If you look at their website, you can find one in your area. I'm not sure if AILA contact is something that you as the applicant initiate or whether thats something your attorney needs to do.
I also calculated the average on the trackitt website for people getting approvals after an RFE and unfortunately despite the 60 day guideline, cases being adjudicated are all over the board, from 3 weeks to 4 months. There is no pattern to this. Its really disappointing, but if you think about it, the case may remain unadjudicated for a myriad of reasons...perhaps the name check isn't cleared yet, or the immigration officer has been pulled off the case for more pressing issues that are taking precedence. I'm planning on calling the VSC soon, since its getting more obvious that my attorneys aren't going to. I'll post my findings, but in my case I suspect that since its a CC case and the cases are intertwined, my wife's approval has been held up since perhaps my name check hasn't come back yet.