The amount of assist is based on a torsion bar in the steering. The softer the torsion bar, the softer the feel because more of the rotary valve is exposed and allows more assist from the pump. Changing the torsion bar to a stiffer one is the answer.
I know street rod shops make a PS regulator, but I have no idea how well they work, if at all and what issues they might cause with the system.
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