I never had knock at no boost, so I cannot tell anything about that.
The times I heard knock was with boost and between 3.000 to 6.500 rpm. If that happened I checked A/F and if that was rich, then I retarded timing.
In high rpm levels, the valve train is making so much noise that nothing is audible. Even the KnockLink is going crazy at 7.000 + rpm.
So I keep on the safe side there. Some tuners are telling me that I should use more advance in timing in high revs, but I did destroy my engine once at high revs on the highway at about 250 km/h, and the results were not nice.
I have 13° at 1,0 bar and 11° at 1,25 bar.
In the past I had about 20° advance in that regions. But, if you know my history with the T-vis, you know a lot happened.
When my T-vis was dying, first the axle/spindle with two butterflies (from one side) came loose. This was resulting in no good fuel burning in all four cilinders at the same time.
The result of this was that the KnockLink was detecting knock. That was strange because nothing changed and still there was knock. So I suspected bad fuel nowadays or what ever.
To eliminate the knock I retarded ignition. The knock was not so often there anymore, but unfortunately this retarding did not rescued the engine. At the moment the butterfly came loose and 'walked' through the engine and turbo, disaster was happened.
Anyway, after breaking in the rebuilded engine I should map the engine again for the high rpm regions. But to be honest, it has no priority. The engine is doing really good, feels strong and she flies to 7.500 rpm, very nice and aggressive.
Second is that I have an E34 M5 (S38B38)to maintain and recently I got myself an Challenger 392 for project. So busy doing other stuff too.