How to export a PDF file from Indesign. (text should be non selectable and file size should be smaller)

I tried to export a PDF from indesign CC3, with "smallest File size" preset. Its giving me very good result, the exported PDF file size is 2.8mb

But when I converted text to outline, the PDF size increased to 15Mb.

I have tried "Transparency Flattener Presets", to create a PDF (non selectable text)

Please help me if you have any solution for this.