I took Anatman to be the Monk version of SAM meditation for maintaining and gaining GL stacks. For cases where the boss leaps away to perform a raid attack or interim periods where a boss transforms.

It may be better to put the effect to regain spent stacks on 6SS so that you TK>6SS and turn 6SS into an oGCD.

I have only dabbled in monk (its on my to level list) but that is my suggestion. Other then that I would suggest bumping the GL timer up to 30 or 40 seconds to make it so that it is easier to maintain stacks and make it so that GL stacks are lost one at a time so that if you do have to take a stack loss its not as punishing.