Ansys Employee

You may need to increase the streamwise resolution near the leading & trailing edges to pick up the curvature more precisely: hard to say but the contour ought to be smoother. 

Well, if the separation point is moving you have answered your question. The flow isn't steady, so the residuals won't converge to text book levels. The question is whether the fluctuations are significant enough to justify the computational expense of switching to transient.