How to create a Word VBA equation using oMaths that formats exponents and fractions correctly

I am using excel vba to write equations in word. I have it mostly working now, except that the fraction component of the equation is not formatting correctly. I want to have an expression that has a fraction where both numerator and denominator have an exponent. But I can't work it to have the exponents in the correct position. Please help.

I have attempted to use brackets and extra spaces - resulting in either no buildup of the equation object, or strange exponents.

Sub TextToEquation()
Dim appWord as Word.Application
Dim eqText as String
Dim ac as OMathAutoCorrectEntry
Dim eqObj as Word.OMaths

'Create new word application
Set appWord = New Word.Application

With appWord
   'Create new word document
   .Documents.Add
   'Turn Math Autocorrect On
   .OMathAutoCorrect.UseOutsideOMath = True

   With .Selection
      'Write Text
      .Text = "x^2 \times x^5/x^3"'Find any math autocorrect and replace with character
      For each ac in appWord.OMathAutoCorrect.Entries
         If InStr(.text, ac.Name) > 0 then
            .text = Replace(.text, ac.name, ac.value)
         End If
      Next ac
   End With

   'Add math object
   Set eqObj = .OMaths.Add(.Range).OMaths.item(1)
   'Build up equation <<< THIS IS WHERE THE BUG LIES
   eqObj.BuildUp
   eqObj.BuildUp

End With

Note: Actual code is different, but this is the relevant code snippet modified to work independently.