If you are familiar with the command line, you can use
pielrf. This is a powerful (if I do say so myself!) tool for formatting text and non-CSS HTML files to LRF. It takes arguments, and the one you're looking for is "--screenheight=HEIGHT" where you
decrease the height to "push" the text down.
Code:
pielrf -i book-file.txt -o book-file.lrf -t "Book Title" -a "Author" --screenheight=670
After installation, just typing "pielrf" on the command line tells you the available options.
You can find the
pielrf download and instructions in the following thread:
https://www.mobileread.com/forums/showthread.php?t=10752
You can also download Sony's Reader Software (free), and check the generated LRF and see if it fits your needs. While not required,
pielrf looks for the "<chapter>" tag to start each chapter. I recommend you add this tag, as it gives you a nice TOC for navigation (among other things).
-Pie