Since the patch on June 29th, bosses that are intended to kite are bugged. No matter how much space you put between yourself and the bosses they catchup, where this has never been the case. Examples of bosses so far.
Explosive Conflict Kephess - Strat has been to kite him and only face tank when a DCD is available to stop for a few moments. He catches up no matter how far you get.
Scum and Villainy Warlords - Sunder is intended to be kite, and since patch, he catches up even right after force speeds and press, etc...plus some of the time he looks to be 20 meters away, but yet still able to attack/damage you when kiting.
Dread Palace Council - Bestia intended to be kite to avoid 4 stacks of debuff, can no longer be avoided.
My assumption is, all bosses with strats to kite, are no longer working.
I will say that this bug has actually fixed Tyrans in Dread Palace, he moves immediately to new square when moving through.