According to the XML you use GETASSE30 as the DEM. Its spatial resolution is 30 arc seconds which is roughly one kilometer. Fine scaled topographic changes won’t be corrected with this DEM. Can you try with the Copernicus DEM instead?
Thank you for the reply. The Copernicus DEM isn’t an option in the drop-down menu to auto download as the GETASSE30 DEM is. Do I need to download it and then use the external DEM option? Thanks.