When using the shenlong set, once you cap your spirit, you are expected to get a damage and spirit drain debuff.
While Channeling tempest rush with the Justice set and epiphany (thus having insane spirit regen), i find that rarely (10% of the time) i get the debuff immediately when topping spirit.
The rest of the time, i will keep channeling while being at 100% spirit from anywhere to 1 to 10 seconds before shenlong actually kicks in.
It is very hard to make this work with the CoE rotation due to the unexpected delays
Edit: I would like to add that this currently greatly breaks the best monk solo push build on seasonal.