3 weeks isn't forever. Relax. Or, if you really want to sleep at night ... take all your papers to an immigration attorney.
The September 29th date isn't a big deal, you can make an InfoPass appointment and get an extension.
PS Yes, being 'light' on your paperwork is probably giving good reason for them to be delaying their decision.
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You might consider hiring an immigration attorney. It would have been better if you had hired an attorney before you submitted the I-751 Petition. At this point, you might want to work with a lawyer to see what, if anything, might be done to help your case. Based on your information, it's not clear what USCIS is doing, but 3 weeks is not a very long time from the date of the interview.
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It would be wise to contact an immigration attorney and let them review the evidence you submitted in your case and to see whether you have complied with all the procedural requirements.
3 weeks is not a long waiting time for an answer. Contact an attorney to discuss what happened at your interview and see if there is a way to help augment your I-751 application