Self-centering is a safety and stability feature.
If you don't get any sufficient self-centering effect with 5.5deg then you have to go for more.
I think that the best solution would be a new top wishbone with 10mm more offset and rose jointed so you will be able to fine-tune the caster angle according to your specific needs.
I will seriously think of making a pair for my car as soon as i finish building it. Maybe earlier than that..
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