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You can try centering the chainring using Sheldon's method:
http://www.sheldonbrown.com/singlespeed.html#tension
https://velowoodcyclery.wordpress.com/2011/04/14/centering-a-chainring/I used it on non perfect round (cheap) chainring and it helped so much. Still not perfect but way better.
Give me couple months and I will make it right, and post some photos then