This is the right way to request remove negative feedback's although its depend who have left you that feedback's. I like this strategy to request. Since you are accepting your mistake and you will never repeat again I think you deserve a chance. I believe actmyname will reconsider this case and he will turn into neutral and admin also encourage to forgive past mistakes. Seems your feedback almost 3 years back.
You should be willing to forgive past mistakes if the person seems unlikely to do it again.
You can send a PM to actmyname and request him for reconsideration.