I applied for a different country this time around. Last year I had also applied for a different research grant (which I didn't receive) with the same institution I'm applying to for Fulbright this year and utilized some of those materials. This time around, I used the same affiliation from that grant application, but I worked with them more closely to come up with a more specific, more planned out project and they wrote me a much stronger letter of affiliation (maybe they recognized that I was determined since I was coming back for a second go at it). I used two of the same recommendation letter writers, only replacing the last one because I had someone new who I had worked with more recently and had a closer tie to German research. I didn't specifically ask that letters be re-written, but I was very specific in my updated requests about the scope of the new project. I don't know if this all worked, but I guess I'll just wait and see! I wouldn't say it felt like I was starting any of it from scratch as I had those previous materials to work with, but I don't think that much of it (outside of the general ideas/essence) ended up much like the original drafts from the previous application.