Maybe a tiered system - the higher up you are, the heavier the multiplier gets.

Street Cop maybe a 1.5x multiplier (those aren't soo far away from common citizens and can't set policy), local politics, Police unit leaders 2x, federal level, police chiefs 3x, international level (think EU or UN, Interpol, secret services) 5x, with prison becoming mandatory for actual crimes (not administrative charges like parking tickets. Fines should be income-based in any case - the multiplier should apply to those too) on the federal level or above.

End all qualified immunity. Public servants lawyers costs can be forwarded by the state during a case and can be covered by the state (or the suing party if they are found to have started a frivolous lawsuit) if found innocent, which should be enough security if they are actually working for the people. I do not see a reason why a politician should have better protection from getting sued than a common citizen.

I would be thrilled to see how politics would evolve in such an environment, where using a smear campaign against a political opponent on local level can cost you 10% of your yearly income as a fine on a first offense, before even talking about a civil case. Politics would become a lot more honest.