You can leave the pick_x and pick_y as is. These just select the data. In the details section, these values are scaled and you can adjust the scaling there.
The slope is calculated based on the xx and yy columns. You can adjust the xx to log base 10.
The take the reverse log here …
We were able to get the work after changing the x to logarithmic.
We also had to increase the aspect ratio to about 20. Does that help?