One wat to possibly resolve this problem is to loosen the chainring bolts just enough so it can move a wee bit. I say possibly, because it depends upon overall tolerances. Anyway, rotate the chainring, noticing the tight spots. Gently tap the chain with a piece of wood or a rubber mallet. Keep doing this until the chain tension is as even as you can get it. Now, tighten up the chainring bolts good and tight. This is also a technique for tandem timing chains, only in that case you loosen both chain rings.