Importing Pdf into Corel

I have imported a 75 page pdf into Corel 14 as curves as I didn't want any font issues, I had to add some backgrounds etc to the document.

As this document is going to be emailed to a lot of people I need the file under 20 mb but when I save it as a pdf it is 120mb.

Is there any way I can vastly reduce the file size without losing quality of the document.

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