Symbology Custom Expression - Need to be able to Label Properly

[JohnDavidson]

Question - How can I customize the label values from being 6, 14, 22, 30?

Context:

In using ArcGIS Pro 2.4.1, I wanted to have symbology that represented two attributes at one time. This is possible using a variety of symbology setups, specifically, I did the following:

Created a Primary Symbology using Unique Values as shown below:

Then I changed the Vary symbology by attribute tab and used a custom expression to set the unique values to be different sizes based on my expression as shown below:

My symbology of the custom expression has resulted in the below: