Seeing as though you graduated with honors, I wouldn't be looking to come off as another person that cries about, for example, a 164 LSAT and 3.5 GPA. Yes, those aren't the highest numbers possible, yes, some your competition will have higher numbers. No, they are not numbers you should be crying bloody murder over, feeling sorry for yourself, and coming off as a whiner.
Normally, I advise against most addenda, but being a D-1 athlete really sets you apart from most applicants and if you choose to write one, make sure you don't come off as making excuses. Saying it consumed your life isn't really a good strategy in my opinion, since who is to blame for that...
YOU. And you come off as trying to blame decisions you made off on something else. That's not what they're looking for. I realize that's probably not your intent, but you must be very conscious of how what you write will be interpreted.
Write a short, to the point, addendum emphasizing your extra responsibilities/rigors and giving them these considerations while they evaluate your GPA, if you write one at all.