The resampling, is this performed only in the case of a section plot? That surely could explain the different appearance. From reading the manual (parameter method) I would expect this to not occur if the number of data samples in the waveform is less than 400k
Have read and tested various of the available parameters but no avail. My work around for now if plotting a single waveform in a section plot is to plot the waveform twice with a tiny separation and then scale them enough so that the separation is not visible. Now of course plotting a single waveform as a section plot may not seem meaningful, but may happen if data is not available for all but one channel.
Did try to look into the source code my self, but got lost among the objects (sorry never really liked object oriented programming, to much of a black box mentality for my taste)