The Power Valve opens sooner with the screw head flush with the casting, or outwards from the casting.
Turning inwards will expose the internal threads of the aluminum casting, as described in the graphs. The standard setting from the factory is nearly always with 2 threads exposed, turned inwards from having the dolly screw flush with the casting.
The secondary/COLORED spring does nothing below 5600rpm, because it is free floating up to that point. A common misconception is that changing the spring will affect low-end torque, but that is not true below 5600rpm. Only the dolly screw will affect below 5600rpm, and then only down to ~4500rpm.