Left / Right Power Difference

I'd ask this question on a Vector 2 forum, but it's gone.  I have two bikes each equipped with Vector 2 (full). One bike always reads 50/50% balance and one bike always reads 47/53% balance.  Is there a way using a fixed weight to see if the torque measured on each spindle is the same ?  The Calibration does not allow this. 

Both pedals are torqued properly.

Any ideas or suggestions are heartily welcome...