I have had the same experiences between the OneTouch Ultra2 and the Verio IQ. The delta between the two is such that the Verio reads higher from between 30–50 points every time. I expanded my comparisons to include the two OneTouch models, and added the Contour and the Relion Prime. Are you interested in the results? I only just started, and probably won’t be as diligent as your test, but I am using all 4 at the same time, using the same drop as you are. So far, I believe, the higher the BG number, the bigger the delta. The Ultra2 has been my base meter for years, so I use that one as my base line. I intend to do calibration against a lab test with all 4 soon.