OS X Yosemite :: Can't Adjust PDF Line Size?

I have been writing a book using Text Edit RTF for composition, and then exporting to PDF.

Before Yosemite, when I changed the width of the RTF writing window (say, from 65 letters per line to 75 letters per line), and then exported to PDF, the PDF reflected the change in letter count - IE the PDF now would show 75 letters per line, just like the RTF did.

Now, with Yosemite, the letter count stays the same in the exported PDF no matter how many letters per line are in the RTF before export.

This is a big problem for me because I was formatting the pages based on 70 letters-per-line and now I am getting PDFs that have 90+ letters per line.  This means that all the headings that I had at the top of pages are showing up a few lines either way from the top. This messes up the look of the pages and makes it harder for the reader to spot topics they want to focus on.

Any way to get the letter count to stay the same in the PDF export as it is in the RTF/Text Edit page before export?