Hello
There is no easy way to fix the line spacing from what I know as the pdf is created through “guessing” because of all the different bits that link to it to create a single document.
When I tested, I did notice that re-creating an expense report did improve one ‘silly empty page’ pdf but from 5 white pages i got 1 so I was happy. It may be too time consuming for you to re-create (not just generate the pdf) your expense reports.
At least you have two choices in expense report models now. Hopefully one is better system-generated than the other.