Speed control on X-30

[Deckerdawg]

I recently bought a 2006 X-30 and it has the Mastercraft speed control. It seems to work "pretty good" around speeds of 18 to 25 mph, but I have not been able to set the speed at a slower speed (8 to 12 mph) for surfing... Does anyone know if there is a setting that can be adjusted on the system? Thanks in advance for any help.