Without the actual HTML, we would be guessing what is causing the empty space in your document. You could try showing the document in RadRichTextBox prior the export and enabling the formatting symbols to see whether they are additional paragraphs in that place. Alternatively, send us your HTML document so that we can look into the cause.
Regarding the font size, you can reduce it by selecting the desired content and calling the ChangeFontSize() method of RadRichTextBox or RadDocumentEditor
. This article
provides more details on document selection.
As to the scale factor when showing a document, such settings are not supported by the PdfFormatProvider so this is not information that is exported in the PDF file. The scale factor with which a document is loaded depends on the software that shows the PDF.
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.