I have been looking for printable grave stones but in N scale without any success. I have however downloaded yours and printed them on both card and labels and will make my own cutting them down to size, hopefully they will be OK, if not I will fade into the distance without passing any more comments, if I like them I will be posting some photographs later on.
I seem to remember somehow, that this problem has been covered before and is easily solved by changing the print percentage before sending the file to print. If you look at the scaling size of Mike's, Wordsworh Railway PDFs they are scaled at 66.1% giving the oo scale, so maybe N scale requires around 30% perhaps. I'm only guessing, I don't do N scale