I know that this may seem counter-intuitive but pitching too little yeast can create yeasty flavors (I assume by "bready" you mean a yeast-like aroma/flavor rather than a wheat -like flavor). What was the volume of your must and how much yeast did you pitch? If the SG is high (more than about 1.120) I think you need to use about 1 pack of yeast/gallon.