Neither Victory or Biscuit will add much since you are only steeping. These grains need to be mashed.
I'd drop the black altogether, and increase the Chocolate to a pound or more.
I prefer dryer beers, so I would leave the sugar in, but as Yooper says, it doesn't add anything to the flavor. If you like beer dryer, leave it in, if you prefer it sweeter, replace it with extract.
I'd reduce the crystal to half pound, and use the chocolate for flavoring.
Wintergreen ?????????? Maybe some licorice, or star annis.