Wadia 850 Digital Volume Setting?

I run a Wadia 850 direct to a Legacy Steradian processor and ML 334 via Tara Labs RSC interconnects to drive Legacy Focus speakers(4ohm/94db). The Wadia manual says it sounds best when operating in the upper half of the digital volume range. When listening to pop or jazz, normal listening is only in the 40-50% range. For classical, the normal listening range is more like 65-75%. The manual also says that the volume control switches are not user adjustable. Am I getting my money's worth out of the digital control or should I find someone to change the control switches?