I've found this way to work best on my Zilla. Swapping the steering arm to the bottom of the spindle mount.

I tried that, but will try it again and take some more measurements to see if I can reduce the bump steer.

Rogue,
 On my 250, I left my shocks on when I did this. Your obviously going to get more extreme measurements with no shocks as it will allow the suspension to cycle further than normal......

Yes, I agree that I should take my measurements with the shocks on - no springs to get true measurements....

Thanks for the suggestions guys.