Extracting graphics from 2ft contour lines

I have 2ft contour lines from a DWG file that I brought into microstation (V8 2004/Geopak Roads). When I use extract graphics (contours), in some areas the TIN doesn't follow the contours very well. Is there something that I could do to make this look cleaner? For example: the purple circle is a high spot, and it connects to the adjacent contours of the same elevation. The green and blue circles just cut corners. I have little experience working with TINs and maybe I am trying to accomplish something that can't be done.

Thanks.