Without looking at your team, I'd say SPD, since even with his scoring attributes, he won't actually score with his ath and SPD so low.
I'd try to get his Def maxed out early on because I personally want a strong defensive team.
If you want him as more of a 3, I'd say LP and Reb next, followed by BH and Pass and ignore PER until he's maxed elsewhere.
My two cents: So in order of importance, I'd go conditioning, Defense, LP, Reb, BH, Passing, Per.