The columns appear as squeezed as they are still not realized and measured.
One way would be to style the exported data setting the e.Styles dictionary with proper CSS values when the ElementExporting is raised for the RadGridView. You can refer to the "Exporting" demo for an example.
As another approach you can check our new formatting options introduced together with Async Export
. You can specifically check the article on ExportFormat.Html.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.