If your printer has it’s own scan to pdf functionality built in just use that. The size problem is simply due to the PDF not being flattened or optimized.
All docs are scanned at the highest resolution possible in my office. If I need a smaller file I simply use a PDF editor to compress the file to something more manageable.
I own Acrobat Pro so it’s just a couple of clicks to reduce a 60MB pdf down to 12-15 MB.
There are other options that cost far less than Acrobat to get things done.