In a way the desire to be proficient at observing your emotions in a detached way is a craving in itself, and craving causes suffering. Let go of the need to be perfect. If you are able to to come in and out of it, like at times you can observe it objectively but at other times your addiction drags you back in, then that shows that your practise is working, just try to pull it back to observing it. Suffering happens, don't let the desire to have a perfect craving free life get in the way of enjoying it x