Automator: Combine PDF pages double or triple in size
I solved the problem using PDF Sam. Description from website: 


  Merge, split, extract pages, rotate and mix your PDF files. Runs on
  Windows, Mac, Linux and any other operating system where a Java
  Runtime Environment (with JavaFX) version 8 or above is available.
  Free and open source since 2006.


Just download the program, which is a PDF tool, and then stick your PDF in it. Once you've done that, you can chose the option to split the PDF.