Thanks. Nope i didnt expedite the case, but i made a call to uscis customer desk asking for my case update. I am not sure if this has anything to get the case approve faster, but i am thinking so. Mine got approved after one week to that call. Same happened for friend az well, called customer desk and asked abt the case delay and they said there is nothing they can do expect waiting for max 5 months, becoz no we doesnt falls under expedite category.
Try calling them and check if any luck comes to your way. Best of luck.