Thanks Don, for a detailed reply.
Sorry to hear you are finding your are on zero. Like most experiences it is subject to change and I wish you improvement.
I can relate to your story, pornography is so easily available that I sometimes wonder how people survived without it a 100 years ago. They seemed to be more accepting of their life-partner and lead a more innocent life; that's my impression.
I think what you are doing will pay off, as per all action (karma) it will reap a result and I would see that result being a strengthening of your will over Mara and enrichment to your insight at least. Something which will help you to help others in turn I would think. Keep us updated