I don't know, I'm not a tuner obviously. I had an issue about a month or so ago with some knock retard. It was pulling about 3 degrees at wot. I thought it was the weather change. So I called my tuner. He sent me two new revised tunes one pulling more timing than the other amongst other changes. I loaded it up the new tune and noticed no more knock retard. I thought it was good but yesterday it started doing the same thing again. Pulling 3 degrees at wot. I thought wtf? So I loaded up the most conservative tune and the KR again went away. I started thinking about it The conditions haven't changed from the first time I have noticed the KR. I loaded the previous tune back up and its rock solid with no KR. The timing now maxes out at 14.5' while before i reloaded the tune i was seeing as high as 17'. So I don't get it? It's like after a while the computer starts pushing the timing up.
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