Hi Tom,
Thank you for your patience.
We have achieved the requested outcome based on your requirement attachment by using WPF SfChart with ColumnSeries and ScatterSeries with custom templates. Each horizontal axis label now has its corresponding elements positioned directly below the axis, and vertical separation between pairs is managed using the chart’s grid lines and layout alignment.
Kindly find the attached sample project and demo showcasing this implementation for your reference.

Additionally, here’s a reference link that demonstrates how to use custom series templates in WPF SfChart: https://github.com/SyncfusionExamples/how-to-customize-the-chart-series-in-wpf-sfchart
We hope this helps you achieve your requirement. Please feel free to reach out if you need any further assistance.
Regards,
Vallarasu R.
Attachment:
SampleWPF_f34bfca5_ef5a137f.zip