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The reason why running lean will burn a hole in the piston is because it makes the car run very hot even if the engine coolant is ok. Having a clogged EGR will cause the car to run hotter than designed and it's one of the things known to cause a burnt hole in a piston. As for your o2 sensors, maybe you should check your wiring running from the ECU to the o2 sensor and also check your grounds to make sure nothing is shorting out or damaged in any way. If you don't want to destroy your car, I would avoid running it lean unless it's for short distances like 15 miles or something.
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