If the survey won't let you submit it until you put some minimum number of characters in each Narrative Text Box, I would write N/A which stands for Not Applicable in every box. If that is too short (being 3 characters) try a short couple of words or phrase like Satisfactory, which is 12 characters, Nothing Notable 15 characters or "This question is not applicable as the answer above is YES" 56 characters. And see if it goes through that way. You can even cut and paste your word or phrase into EVERY narrative block where you didn't have a comment.