I've made a nice honey wheat, somewhat a clone of boulevards wheat.
6 lbs pilsner malt
3 lbs wheat malt
4 oz gambrinous honey malt
Usually use a quarter ounce galena to bitter, bit of cascade to finish. Shoot for about 15 ibus.
Are you using tap water? My first 8 brews or so had a distinct plasticky of flavor that came from the chlorine in my city water. Try using bottled or filtered water for your top up portion. The boil should take care of the rest. You can great beer from LME.