The trouble with Deakin is that he tells us that if we don't have an engine monitor showing temps on each cylinder, then we can't use his techniques.
Probably a quite reasonable statement. But not much help to those of us with only a single EGT gauge.
Of course this makes you think it might be better to not lean at all, use more fuel, but spare the engine.......but then you wind up fouling the plugs. Probably the only safe way to operate in this case, is to use power settings below 75%. According to Lycoming you can't damage with leaning below 75% power.
Just my uninformed thoughts.
dp