It is possible to do a 2/3 stack rotation, so i would suggest you just take 2 stacks and the monk 3, this should allow you to not be slowed down enough from the 3rd stack that you are unable to move out of slams.
Tanks with a charge has an advantage in the 2nd phase though, as you can entirely avoid getting knocked up by just charging either the boss or one of the hands as it happens.