Nope, but you're using an offset voltage instead of a consistent one. For initial testing, it's better to test with a set voltage, find stability, and then take that knowledge to apply the offset. When the multi changes, the voltage changes, as each multi has it's own VID associated with it. As well, there are other conditions that can adjust that VID, so rather than dealing with that for testing, simply avoiding that is best. That's why I didn't include your OC voltage in the chart. It really could be anything, and as you can see, as load changes, so does the voltage, so who's to say what you are really running?