Atm i only use Feint in a few conditions.

* Move more time than a GCD usage or i have an oGCD to use. Sometimes i have the GCD to use, dodge an aoe ground, use feint and i have to wait for GCD reset to shot again. It's weird :/. I prefer don't use Feint and delay my GCD to, once i dodge the aoe, use HS/SS/IJ.

* I need a fast attack to kill a mob and don't wait for a cast and the tick damage, like Adds in a1S, a3s and a4S. Feint damage is executed instantly instead others abilities which damage take more time.