Converting my Imperial Stout recipe to Imperial Milk Stout recipe

Hi.
Im trying to convert my own Imperial Stout recipe to Imperial Milk Stout recipe (Im going to add some rally good coffee to it and maybe some cocoa powder also). I've: reduced the amount of roasted grains, the amount of hops and added some flaked oats to it. It's going to be big, massive and complex.

Batch size: 10l/2,5gallons, Boiling volume: 16l.
Est. OG: 1.103, est. FG: 1.026 (OG will go down, because of the coffee, maybe to 1.095) Bitterness: est. 130ebu, color 145ebc.

Malt and sugars:
67% Pale Ale malt
5,5% Oats, Flaked
5% Roasted Barley
5% Chocolate Malt
5% Lactose/Milk Sugar (added during boiling)
4% Cara60l
2,5% Carapils
2,5% Flaked Barley
1,8% CarafaIII
1,8% Special B

Hops:

60min 70ebu from Magnum, 1oz
45min 20ebu from Chinook, 0,35oz
30min 25ebu from Columbus, 0,5oz
15min 7ebu from Fuggles, 0,9oz
0min 3ebu from Fuggles, 0,7oz

Other:

0,5l Coffee at flameout
50g of 99% Cocoapowder to secondary
(If needed I might add some cold steeped coffee to secondary also.)

Yeast: Wyeast 1084 Irish Ale Yeast, with 2l starter. (I also have some S04 just in case).

So any feedback about the recipe or thoughts about the coffee and cocoa powder.