@KungFuJosh,
I agree about the lower current setting. I sort of started this by observing a huge overshoot on my R&S NGE103, which is now being investigated by R&S. That overshoot is happening at all currents below 140 mA and is always up to 140 mA.
So, maybe this NGA 142 is doing allright at 40 mA but behaving bad at 10 mA. Maybe @pdenisowski could repeat this test at 10 mA as well.