Hi,
What were you focussing on / metering off?
Were you using spot metering (meters from the centre or selected focus point) or matrix metering (meters from the entire scene average) (They are the nikon terms ... not sure what they are called on your camera.)
For me the shot you label as -1 EV looks to be the best exposed of the group. You can still see most of the detail in the gravel behind the machine
The shot labelled 0 EV looks to have more elements that are blown (over exposed) already and therefore you will lose detail in those components.
For me the HDR in this case is too rich in the colours portrayed. I think I would also prefer a closer crop. Maybe just of the machine in portrait
mode, and not the whole area. Are you able to physically get closer and or zoom in?