Have you tried downloading an actual PS3 edat file format to try first? This will eliminate if you are converting correctly.
What version of Rocksmith 2014 are you using? If you have Rocksmith 2014 and Rocksmith 2014 Remastered installed on your local PS3 with HEN, then there are 2 separate directories. Don't remember the path off hand but I think the edat files to into dev_hdd0/game/BLES01862/USRDIR/DLC.