"Yes, if there's something we know for sure increases rationality, we should be spending more time doing it instead of brainstorming new techniques"

We already know of a something. It is a very basic and rudimentary something, that we are all familiar with, and we all have the capacity to utilize. But most of you aren't doing it!

This has been discussed at OB repeatedly. We're carrying a lantern to look for fire.

"Compare alcoholism. The mundane solution to alcoholism is to say "Just stop drinking so much" - this seems in keeping with your diet metaphor. This mundane solution very rarely works, thanks to a particularly nasty form of akrasia. The Alcoholics Anonymous program, various anti-alcoholism drugs, and other "gimmicks" are much more effective."

Actually, no, they're not. AA is plagued by dropouts. What it's good at is getting the people who remain with it to believe it's helping them and say so. What it's terrible at is getting people off alcohol.