The best enlarged negative that I have seen was made by the Ilford UK printer who copied well nkown photographers original negatives of images they used for promotional purposes and the Ilford swatches. His method was to make an 8 x 10 print from the original negative but at 2 grades softer than he would normally use, generally the soft print was made on grade 1. He then copied the flat print on to FP4 and processed it normally, the result was always superb. The first time that I saw this done I had difficulty in deciding which was the copy.