Hi Justin,
Thanks for using Syncfusion products.
We suggest you to set "TickLabelsDrawingMode" property of primary X-axis to usermode, for manually configuring the labels of primary X-axis, and "Add" method of primary X-axis labels to add custom labels to a data point. Also, we have created a simple sample for limiting the labels of primary X-axis and a screenshot of the output in the attachment.
Please let us know if you have any concerns.
Regards,
Anandaraj
AxisLabelCustomizationForum_a9dacdbd.zip