It sounds like you just haven't found an employer whose standards are as high as yours. I wonder if you could get work restoring custom cars? Someone somewhere will appreciate your level of attention to detail, the trick is to figure out who. Who repairs fire trucks? Or even race cars. I know this stuff is sort of out there, but I am trying to think of places where people really will care that everything is done just so.

Until then, your best bet, like someone else said, is to just keep your mouth shut unless someone's life is at risk. If someone wants to run a poor quality shop, let them. Just take the money and do your best. I also have a really hard time watching people slack off and do things inefficiently, but I'm getting better at just keeping it to myself.

Can you fix cars out of your driveway? I've known a couple of people who make a living doing that.