I'm sceptical of the whole genre of this question. Every few months there's a thread like this, everyone posts their system, and six months later the same people are back with a new system.

Maybe the honest answer is that it's hard, it stays hard, and the system matters less than noticing when you've slipped.

That's probably true, and it's partly why I asked for specifics. I'm less interested in the perfect system than in what people have kept doing for more than a year.