I'm curious as to when other Dancers use Devilment, before or after Technical Step/Finish. Personally, I've been basing the decision on Esprit and Feathers. If I have little/none, like at the beginning of a fight, I will use Devilment BEFORE TS to boost the odds of getting a crit TS. But when I have Feathers and Esprit built up, I have been using Devilment AFTER TS to try to fit as many things into the window as possible. I'm not sure about what is optimal play. It just seems like a waste of 5ish seconds of Devilment to crank out TS if it means you lose the buff before you can work through all your Feathers, Saber Dances, Flourish Procs. Saber Dance being oGCD would help so much, IMO....
What do other people do? Does anyone have hard data about optimal use?