Quote Originally Posted by Crunch View Post

When I did my test upload, I failed to delete blank columns do this but, I don't see anything unusual that makes me think I screwed something up.
No, no you should be good. Once you download existing data and change some stuff in the txt file and re-upload you want to be careful and not import empty fields over existing data.

Just always backup db, do some test importing with just a few items, see if the resulting import is correct and then do your bulk. If not correct, just restore and try again.