In reaching a decision on a disciplinary action under the Administrative Procedure Act (Government Code section 11400 et seq.), the board shall consider the disciplinary guidelines entitled “Disciplinary Guidelines,” (Rev. 2/18/89), which are hereby incorporated by reference. Deviation from these guidelines and orders, including the standard terms of probation, is appropriate where the board, in its sole discretion, determines that the facts of the particular case warrant such a deviation--for example: the presence of mitigating factors; the age of the case; evidentiary problems.