Thanks, I just returned from your post-doctoral thesis (and slow page loading) on the Rally power meters 
I’m not power meter testing, I’m simply doing a sanity check. Agree with everything you said, and have seen the same.
What I found weird, and slightly disconcerting, was to see the L/R balance shift from right to left, then back to right, and then slowly settle down closer to 50/50 (47/53).
That said, after a week of settling down, the total power is ‘good enough’ when compared to the SRAM Red/Quarq.
Have a great day, long time reader (2012?) and supporter of your site.