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I think having a slightly negative roll axis front and rear is what you want.

I designed my flat fender chassis that way. It is just a regular SUA design without a shackle reversal. You can't find too much about leaf spring geometry, but the idea seemed to work out pretty well for me. In general, having the roll slope slightly negative should make the steering wheel less responsive to input, specifically to things like road crowning. Tracking down the road should improve also. It should also allow the front axle to move rearward slightly on compression depending on spring arch.
 
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