Hey, Tom. From what I can tell in the CastleLink software the timing setting in an ICE controller does not allow you to set degrees. The controller determines the appropriate range and the 0-20 setting determines where in that range you are. Lower being less watts but more efficient and higher being more watts and less efficient.
The motor timing description:
Motor timing advance settings changes the timing advance range used on the motor. Generally, low advance gives more efficiency and less power, high advance gives more power at the expense of efficiency (motor heat). Every system will respond to changes in advance differently. Castle Creations controllers automatically determine the correct and best range of timing advance for any motor they are plugged into. You can move up or down within that range via this settings.Sean