My thinking was the same as BradH, so I asked someone who is pretty smart on this stuff. (A successful enginemasters contestant) If I remember right, he said that peak VE occurs at the same rpm as peak torque. Below that rpm, with a big womping cam, you are bleeding off enuff cylinder pressure to reduce the chance for detonation. And above peak torque, ve drops off naturally, also diminishing the chance for detonation.