So I have a chart in highcharts, you can view it here.

I want to have the scale when below 0 to be much tighter than above 0
essentially I want the below 0 to be closer to the bottom value, rather than the 500k difference we are currently seeing.

I have tried alignTicks: false, which kind of helps a little, but not quite what we are after.

I have also tried to yAxis[0].setExtremes(min, max), but it seems to ignore the min and use the same step difference above 0.

Is this at all possible with highcharts?