Use a small mounted stone or a Pink Zirconia Coarse Bur to add detail to the partial. These tools allow you to get into contours that are hard to reach. Stay in the section until you shape into the way you want it.
Do not do a lot of finishing around the clasp. If there is too much grinding on the clasp, once you fit it it the model, it may not be accurate in the way that the clasp falls on the tooth. This will compromise the esthetics of the partial. Everything about esthetics is in the clasping, bad clasping in anterior sections are very noticeable. 

When finishing iFlex™ use slow speed.