Home Off is to set the machine coords zero at an offset position. ie if you had the home switch halfway along a 500mm axis then you would put a Home Off value of 250mm. That would mean that when you homed the machine coords DRO would be set to 250mm as that is the distance you are away from the true machine coords zero.
Now what I think you want to do is set a G28 position in the Homing and limits page and then if you had
Code("G28")
at the end of the Ref All buttons VB it would move to the position you set after the axis have homed. Be careful though just in case it does something you are not expecting, ie keep the hand on the E-Stop

Hood