Have you cleared codes either by scan tool, TP or removing power from PCM? I don't remember where you were and don't want to confuse you with someone else...

Sure, look under flags for "Knock Sensor Diagnostic, Error 43 " and uncheck. This will disable the code 43 CEL light only and not the knock system.

If you go further to disable Knock System Retard for timing I would look at data logs first to see how much and where knock is and how much spark is being retarded!