GridView.BestFitColumns doesn't fit all content

Trying to export to xlsx I am creating a GridView and GridControl in code. After binding a DataTable to the GridControl I call the BestFitColumns method. To my surprise most columns in the exported Excel file have a width which is smaller than their longest content. I want the column width to adjust to the longest content. How can I achieve this desired result?
Below is all the code I use for manipulating the result:

Visual Basic
gridControl.BindingContext = New BindingContext()  
gridControl.MainView = gridView  
gridView.GridControl = gridControl  
gridControl.DataSource = dataTable  

gridControl.ForceInitialize()  
gridView.PopulateColumns()  

gridView.OptionsPrint.PrintHeader = True  
gridView.OptionsPrint.PrintFooter = False  

'Disable grid lines  
gridView.OptionsPrint.PrintVertLines = False  
gridView.OptionsPrint.PrintHorzLines = False  

'Best fit columns  
gridView.OptionsPrint.AutoWidth = False  
gridView.OptionsView.ColumnAutoWidth = False  
gridView.BestFitColumns()