If you're going to use a pound of lactose, then mashing hot at 156 F is overkill. Mash normal around 152 F. Either that, or mash hot but only use 3/4 lb lactose.
Not sure, but that seems like a lot of chocolate malt. I might take that down a hair, maybe 3/4 lb.
Looks great otherwise. I'd drink a lot of it.