Congrats, Jrjw! I did the same and my only regret is that I didn't do it sooner!
It always irritates me when I see people post about writing their DA letter and then others discourage them from doing so, claiming you're playing by their rules. I lived under that premise for many years before I finally wrote mine and sent it in.
I did so for two reasons: 1) I primary wrote the letter for me, and not them. It was very cathartic putting in into words. 2) Yes, I did play into their "rules". Under their rules, I was still a JW, but just an inactive, lost sheep that needed saving again. And this delusional thinking of theirs was impacting my life ... a lot. So, my letter made sure everybody involved was on the same page, regardless of whatever rule book they were going by.