No problem AB139engineer, the chart works well using a Chadwich 8500 and photocell (which is what Agusta Vergiate use also, if Hums is not fitted)
Could you still use that chart by ploting the VXp clock angle and ips level?
It may need a clock angle correction if the velocometers are located in a different location.
Does VXp have a photo cell to pick up the out of track blade?