More speed, more agility, more vision (not Superior Vision)...more carrying. It is pretty difficult to take a player designed to be a CB and make them an elite return man (the build order for return men is generally speed and agility to 4th cap, vision to 3rd cap, carrying/strength to 1st cap, confidence to 1st cap, etc).
Agility looks decent. Get Speed, Vision, then Strength and Carrying up (1st or 2nd cap). Get as much Return Spec as possible and put points into Special Teamer and Return man. After those, work on confidence/stamina.