I am unable to properly calibrate my stand alone Doser 2. It is the three pump version. When set to the same speed in the calibration settings on the console, the three pumps run at dramatically different speeds. On speed setting 2, pump 1 delivers 6 ml/min, pump 2 delivers 12 ml/min and pump 3 delivers over 30 ml/min; all set to the same speed? Furthermore, changing the pump speed in the calibration settings has no effect on the rotation speed of the pump heads - surely it should? I see nothing in the manual to suggest how to remedy this problem.