Not sure if this beer needs a decoction to emphasize maltiness. Maybe make one with decoction and another soon without it.
I get enough malt character from the yeast and malt/caramunich. Very close to a Schneider original. if you've ever had one.
Tettnanger will add it's own flavours to the beer, and I have not made this beer with Tett. I have made other weizen recipes with Tett or Spalt or Saaz. All turned out well, as hops is a minor player in the flavours in this style.
How long until the comp?