I personally wouldn't comment on the harshness of the punishment you received. Let them make their own judgements. Honestly, I don't think the addcomms are really going to care about the punishment you received anyway. They give very little weight to such matters from what I've heard....it's more about you coming clean with it and taking responsibility.
I have one violation I have to report. I went to the courthouse and got a copy of the judgment (or whatever it is...it's the paper the Judge signed with my plea and sentence on it). I'm including that as well as an addendum to tell the briefly what happened and how I will never do it again, bla, bla, bla. It was nearly 10 years ago, I'm ticked I even have to mention it. (I'm 29, BTW).