I don't know but I'm guessing the amount of hydraulic pressure boost the pump provides. The steering on my '01 just feels heavy and while it may have more of a return to center it feels vague at the same time. My old '89 had a lighter feel but felt more precise in steering input and response.
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the sector shaft adjustment nut on the top of the box is your preload for steering feel. although you can adjust it its not recomended. not enough and its real loose, just a smidge to much and youll have no return to center. if its only feeling loose and theres no slop inthe steering linkage dont bother with it.
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95 Ford Lightning (sold), 09 Caddy CTS-V, 04 Buell Firebolt XB12R w/true flame paint, 00 harley XL chopped, 81 Trans Am, 85 K5 Jimmy 4 inch w/35s, 92 cherokee
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it might be similiar to the setup on my dads durango. the steering keeps the same resistance reguardless of the RPMS. on my 90 dodge the higher the rpms the easier the wheel is to turn, wiuth the durango its the same. provides a better feel at highway speeds.
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The more caster a front end has the harder it will be to steer away fron center but will center itself easier. Or it could be the other way around. I can't remember which.
I'm thinking of a Chopper with a big long fork, and how that would affect the turning, etc. Does more caster = closer to the front end of the car, or closer to the rear end of the car? I can never remember... I kinda see what you're getting at though.
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Does the steering wheel return to center after completing a turn on its own pretty well? If not, I would suspect caster is too low, and would take it to get an alignment and have them give you a print out of the specs.