Not sure of tire pressure. Will check that and stiffer shock availability. As far as shims, would this be to change caster (positive or negative)? Dave V
Yes,caster shims are to change caster angles,it's all to do with KPI (king pin inclination)
My understanding is positive caster will produce lighter steering but will also affect the steerings ability to self center.
Negative caster will ultimately make the steering slightly heavier but it will track much straighter.