Exactly, unless you are class racing and need every last horsepower, your engine won't know any difference if the compression is a few points lower than the danger zone.
Yup and no matter how hard you try to get that through, it never hits um. The big issue is, once the heat gets to the point of creating detonation, it's pretty difficult to get it to cool off. About the only option is to shut it down and sit there.