The skill feels really outdated compared to other skills which have had new items added for or activities.
What I think should be added in, is perhaps a new activity that makes the graceful set useful to have to help complete it which gives good experience at the end. Could be a competitive minigame where you're pitted against other players?
Another thought I had was bringing in an upgraded version of graceful that require marks of grace that'll do either of the following; give bonus xp drops (like other such skilling gear), or give passive xp whilst you run.