Frank, so great to see you're really engaging with us now. Makes me so happy to see you "coming out." And I agree that drinking 1 day out of 5 (reverse of what you had been doing) has got to be seen as an improvement. Maybe make it 1 day out of 10 next and then 1 day out of 15 and keep making those stretches wider and wider.
I know many will say that's a sucky plan but I think it rocks. Stepping stones. If you can't sustain straight sobriety, at least make progress.