I have two DEs and have tried 4-5 blades and they all overhang a bit. If im not mistaken it is to aid in removing and replacing the blade (so you dont have to shake it out or touch the sharp part)
DE blades are very thin so you can prollly cut it down to your liking with some old scissors. You could also run it over a nail file or sandpaper to ensure its smooth. Good luck, let me know how it works out!
