How Knock Limited Are the Gen 5 Engines

[kriskyk]

Curious to know from those who have self tuned or have been involved in tuning the gen 5 Viper, how Knock Limited these engines are?

Is there much power under the curve left on the table using higher octane fuels as one approaches minimum best timing / maximum brake torque?

I think I have seen graphs and or discussions around a lot timing be pulled at peak torque?

For those who road course track, have you logged how much knock and or spark retard is occurring when things start to heat soak?