I find that controlling your anger is like a muscle exercise. You need to do keep doing it consciously. No matter how much you meditate, or find other ways to relax yourself, there will always be moments in your daily life which will trigger your anger response. It's like this for every human. You need to train yourself to take that buffer of 5,10,20 seconds to control your anger response. And like a muscle, you'll have to do this every time you feel angry, no matter how justified that anger feels in the moment. Because you will always regret it afterwards if you take out your anger in the moment. In my case, I tell myself that even if I feel that the other person is being wrong or unreasonable, I will not react right now. I will stay quiet, think about it by myself when I have some quiet time and then communicate what I felt to them in order to work out a resolution. Sometimes the mind thinks that it is being subordinate or stupid by not reacting immediately. After all, expressing anger is a way of seeking justice. If you assure yourself that you are not allowing injustice to happen to yourself, and you are just taking a different route rather than an anger outburst, you could be able to avoid taking out your anger on others in the moment. Obviously there will be some people who mistake such behaviour for passiveness and some also try to take advantage of those who don't react in anger. But I would say don't bother about them, I have found life is overall better for ourselves and our close ones when we follow this.