Default Sorting by custome field, then by distance

I have created a custom field labeled as “priority” with the options of “1,2,3,4,5,6,7,8,9,None”, with “None” being the default value.

I would like searches to be sorted by this priority field first (So a search of a zip would return results 1-9 first), then after this you would see any other closest “None” priority results displayed.

I currently have the “Priority” field as the default sort order, but what I get when doing a search is a listings list that are sorted first by distance, then by priority.

So I get a list like this:

Listing Item A
Distance: 25 Miles
Priority: 2

Listing Item B
Distance: 27 Miles
Priority: 3

Listing Item C
Distance: 35 Miles
Priority: None

Listing Item D
Distance: 41 Miles
Priority: 1

Listing Item E
Distance: 44 Miles
Priority: 4

What settings do I need to adjust in order to get this list to look like this:

Listing Item D
Distance: 41 Miles
Priority: 1

Listing Item A
Distance: 25 Miles
Priority: 2

Listing Item B
Distance: 27 Miles
Priority: 3

Listing Item E
Distance: 44 Miles
Priority: 4

Listing Item C
Distance: 35 Miles
Priority: None

I am currently using the latest version of all Geo plugins, and WP.

Thanks.