The 2G pump is basically identical internally to the older version. The flow control valve is actually a 3-stage setup. It has two ranges where it decreases flow (sharply between 700-1000 to compensate for weak pump flow at low RPM and at a slower rate at 1000-3000). And the final stage above 3000 RPM where the assist is limited to a fixed size flow channel. You don't want to completely remove the spring - You'll end up with way too much power assist at freeway speeds (resulting in mushy steering feel). The result is a pretty linear pressure vs flow slope up to about 5500 RPM. The problem is that above that, flow drops off rapidly when the relief valve opens to prevent the pump from exploding.
The best result will probably be had by shimming the plunger to somewhere in the middle to end of the 1000-3000 range if you still want to retain some steering feel.
More info Here
, page 19-11 if you're interested.