I've read every post on this thread and commented earlier.  I get the impression that even after nearly everyone has suggested to run a calibration load (known quantity against known acres) you still want to blame the premier meter on the market for not being capable of doing something we've all been doing.  I regularly plant beans at 140k at 6 mph with the vDrive/vSet/WaveVision combo.  My displayed rate is only dead on if I drive less than 4 mph.  At 5-6 mph it shows 137-138k. The applied rate has never been off and this is after running many thousands of acres through the machine over several years.  The 20/20 monitors do not calibrate themselves off the displayed population.  It is 100% based on speed and meter revolutions.  The monitor is a verification of what is being dropped and you're well within the tolerances of beans.  If it was corn I'd be concerned but there is not a sensor on the market (that I know of) that can read 150k at 6 mph and count them all.