Moderation has caused me so much trouble too. Well, my inability to moderate!
I've been trying to achieve moderation for 6 years, went to AA 3 years ago and thought I could control it and just went back 40-odd days ago after giving up. That has been the start of my recovery, knowing that the next thing I lost was more important to me than alcohol and giving up on the idea of moderation. I just got tired of the hiding, secrecy, being ill, lying...everything that goes with drug and alcohol abuse.
A day at a time, just take it easy and take it minute by minute if you need to. 4 weeks is brilliant and you know you can do it again. It's entirely achievable and we are all in the same boat!