timing chain question

The main reason for the different positions is to centerline the cam according to the cam makers specs, some cams are in need of correction and these positions allow for this.

I have heard though that if you want more torque at lower rpm's you retard the cam off its centerline, and if you want more horsepower at higher rpms you advance it. I may be mistaken about that relationship but its either the way I described it or exactly the reverse. Maybe someone else will know better than I. Normally most people install their cams at the recommended centerline of the cam maker.