The only way to it seems to reduce your bounty if it is too high and guards attack you on sight, is to use the harmony magic scroll/spell and then talk to them, and maybe you can pay off your fine. Although if you broke out of jail with the forsworn, I don't think you can get rid of your bounty, as it is a story plot event and can't be undone.
i thout setcrimegold lowers bounty?