Survey Platform (Before March 2021)

We recently added a new "Event Type" code to our survey (as Embedded Data) and I would like to go back and add this information to responses collected in 2016. In the past, I have done this for a few responses by "retaking" them with the Embedded Data value appended to a query string in the link. However, this changes the "Recorded Date" for the response which isn't acceptable for this project as it is a longitudinal study. Any other way I can add this field to old responses?

Today I made some edits (added questions) to a survey I distributed last week. However, the respondents that I've talked to since making the changes are still seeing the old version of the survey. What is going on?