I don’t do a lot of surfacing and don't know all the levers and knobs, so with that…  I'm trying to make a curved surface with the Planer Surface tool.  The sketch I'm using is a smooth arc (curve1.jpg) and when I turn into a surface it becomes chunky/not smooth (curve2.jpg).  I've included the settings I think control this (Settings1.jpg & Settings2.jpg) but nothing I do changes this.  What am I missing?