cost of living argument will not work and there is no one to call and argue over the phone about that issue. However, it is your income now, not in 2011 (although you do provide that return). So what I am saying, if right now, with your salary you do meet the poverty guidelines, you must send all proof, explain it to the service and you should be just fine. Another option is to obtain a financial co-sponsor.
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Just get a joint sponsor whose income meets the guidelines. Also, if your spouse is lawfully employed, you can combine her income with yours as long as she will continue to derive income from the same job after she becomes a permanent resident.