TIFF format is more about the wrapping than the encoding. You can compress using many different methods within a TIFF wrapper. I would suggest that you produce your black-and-white images as CCIT4 encoded TIFF files before calling gs to create the PDF file (i.e. use the option "-compress Group4" when running mogrify/convert). I'm not familiar with scantailor, but maybe it offers that option out of the box.
When I was first scanning my books, I would use convert to produce the TIFF files with CCIT4 compression. Then I would use tiffcp to combine the separate TIFF files into a single multi-page TIFF file. I would then use either tumble or tiff2pdf to convert the multi-page TIFF file into a PDF file. Then I would use gs as the last step to add PDFMARKS to the PDF file.
Nowadays I used pdfbeads, but that has become more complicated than my old way because the program is no longer maintained and is very difficult to get working on a modern system. I use my old copy of pdfbeads within an old linux distro running inside VirtualBox.
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