Try that same recipe with 1 oz of Hallertau Hersbrucker at the beginning of the boil and nothing else (except for maybe Irish Moss or a Whirlfloc tab @ 15 mins). That ought to bring it closer to the style!
Thought American weizens were higher on the hops than the Bavarian styles. Hallertau is a little on the mild side, but I might suggest a 15/30/60 1oz addition of them. Might get a bit more of the tartness that an American weizen gets. I wouldn't use IR or Whirlfloc though, but that's just my preference since I like cloudy weizens. Take it for what it's worth.