Should I be concerned about my non OA visa application being processed so close to my flight date?

Sometimes they just wait until the very last days prior to flight date stated in the application. They approved mine the day before my travel date after more than 1 month of keeping it ''under review''

You could try messaging the consulate through their Facebook page. They tend to respond fairly well on Facebook. Just make sure you only send a single message, short and concise, with all the necessary information.

Hello my name is xxx, passport number xxx and OA visa application XXXX. I submitted my application on xxxx and wanted to check on the status as it has been a month and my flight date is soon.

Something like that.