Jackson, Did you try increasing your number of segments in your arc or circle when you draw it in SU?  You have to select the arc (it defaults to 12 segmts) and change the segment number to 50 or higher (I did 100- very smooth, very high memory/long render time)  Here's a test I tried w/ a curb I drew in SU and used the 'follow me' around a curve w/ 100 segments.  I might try 50 segments next time... it takes a lot of memory w/ that many segments.  In VUE I set my auto smoothing to 35 I think... but unnesessarily probably.