Can you share xaml file of your title?

Try this. I've used Microsoft Blend for Visual studio, and added one comment between <!-- and --> in file.
Hope, I understood you right.

You can use Visual Studio (VS) 2015 Community Edition, and express editions of VS versions below.
The one application you needed is Microsoft Blend for VS (MBfVS).


For example, you've created title and save it as "TEST.xaml", and you will to make some changes, which are not accessible from vMix Title designer. Then, you start MBfVS. At this time you must create project:

File->New->Project (or Ctrl+Shift+N). You will see window, where you must select project template. You need Installed->Templates->Visual C# (or Visual Basic)->Classic Desktop->WPF Application (or WPF User COntrol Library).

When project is created, you must import in project references vMixTitleLibrary, which is located in vMix folder:
Click on "Reference" node in project browser located on the left, select "Add Reference", then "Browse...", then select vMixTitleLibrary.dll.
You can close Reference Manager window.

Now, just Drag'n'Drop your "TEST.xaml" into your project and open it by double click on the "TEST.xaml" node. You will see WYSIWYG editor in the center of screen, object browser in the left bottom, and if you select any object, you will see it's properties on the right of the screen.

For scaling your numbers I've used "Transform" property.

That's a short briefing.