Bump Steer will also be affected by what kick-angle you are running.
I run 25 deg Kick with 5 deg blocks and no washers on the steering arm and have pretty much zero bump steer.
But if I use the taper 20 deg kick wedge, then I can get massive bump steer.
The other thing that can affect it is the axle height - i.e. what shims you run above and below the c-hub.
Try to visualise what is happening to the height of the outer steering ball joint when you either change the caster angle, kick angle or axle height. It is this height change that is causing the bump steer.
Once you visualise it, it is easier to figure out what needs to change in order to reduce / remove the bump steer.
HTH
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