The article mentions that felonies did not produce a sentencing bias. Perhaps this is because sentencing guidelines for more severe crimes are also more closely

The article mentions that felonies did not produce a sentencing bias. Perhaps this is because sentencing guidelines for more severe crimes are also more closely defined by the points of the case and judges have less latitude in sentencing. If so, could other forms of bias be mitigated by providing additional guidelines for sentencing in those cases? Do they simply suffer from lack of attention to the guidelines?