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Okay, Im here if you need me.
Im not sure what is going on here , your base timing as well as advance look to be in specs. In most cases if you have a lean engine type ping it is due to the EGR valve but unplugging it eliminates that . What happens if you back you base timing down to 8 degrees BTDC?
Running the timing at 5 degrees should have solved any ping being so retarded, are you absolutely sure this noise is actually detonation?
Well if its gone with the SPOUT out and with everything you have already tried I would suspect it has to be a bad PCM, the computer controls the timing once the SPOUT is in place. Unfortunately the only way to know would be to replaced it and that could be a very costly guess.
Okay , Im leaning that was as well. Not much left at this point. Let me know.