Increasing Read Time Delay for PDFs

Hello, 

I am working on some accessible PDFs, and have already implemented Paragraph styles and a Reading order. However, when I export the PDF to Acrobat and test out the Screen Reader I find that it reads the document much to quickly, and in most instances cause it all too run on together. 

I've tried searching with no luck. Can anyone tell me how to add a delay between my components (H1, H2, P, etc), so that the screen reader reads the document at a normal pace, and doesn't cause it all to run on together and become incoherent? 

Thanks!