The stock steering boxes always have that "over boosted" feel to them. You can adjust the pressure put out by the pump by adding spacers to the pressure valve. Some people have said it really changed the feel of the steering. On my stock box, I didn't notice any change by adding shims to the pressure valve. I sent my Dart's steering box to Firm Feel and they rebuild it into a stage 3. I have not driven the car yet to feel the difference though.
That might be what you need to do. Have your box rebuilt and go to a stage 2 or 3. Then you can fine tune it if needed with the pump shims.
