As your documentation wasn't promptly accepted, the officer might have started a more extensive verification, which might involve contacting the people mentioned in your letters, and that may have to be done by your local consulate's officers. While taking this long it's unusual, there are a few other people whose approval was delayed like yours. As your file is about to complete 2 months of processing, you might try to inquire them again. But be polite, asking something like "maybe you have already sent my nomination, but it might have been trapped by the spam filter". You can mention that you're concerned, as most people you have contacted got their nominations in less than a month.
In the end, your file may be in a "hold pile", and it's possible that the simple fact that 2 months have passed without updates from whoever they asked for information makes them ignore that phase and give your nomination anyway.
