I think you'll be a lot happier with it moved down. I went from a 53 to a 50, and I didn't move the FD. When I finally decided I was unhappy with the shifting, I moved it and shifting got a lot better. But I could tell on the stand that the shifting wasn't good, so trying it isn't going to hurt anything. Just recognize that shifting that's a little slow on the work stand is going to be more of a problem on the road.