Hey, don't lose hope... I found this thread by Jerome Colas, about reducing PDF file size
Try these steps:
1. Download the quartz filters made by Jerome Colas LINK
2. Move the FILTERS folder on your Library folder ---> /YOUR HARD DRIVE/Library/
3. Open Automator, create Application (Not Workflow!!!)
4. Search and drag "Open Finder items" to the right
5. Search and drag "Apply Quartz Filter to PDF Documents"
- when prompted "This action will change the PDF files passed into it. Would you like to add a Copy Finder Items action so that the copies are changed and your originals are preserved?" Click Don't Add
6. From the Filter drop down, select Reduce to 150 dpi average quality - STANDARD COMPRESSION
7. Save it to your Desktop.
8. To resize PDF, just drag the PDF file over the Automator Application you saved on your Desktop.
Your PDF file size is now reduced, without compromising the quality! 🙂
Thanks to Jerome Colas for the wonderful quartz filter!