Swamphen Brewery - KBS clone of a clone

Looks like the original recipe is behind the paywall at the link above. My version is below:

KBS Clone_small

Method: All Grain
Style: Russian Imperial Stout
Boil Time: 60 min
Batch Size: 14 liters (fermentor volume)
Pre Boil Size: 17 liters
Pre Boil Gravity: 1.066 (recipe based estimate)
Efficiency: 70% (brew house)
Calories: 290 calories (Per 355mL)

1.087 OG
1.022 FG
8.51%
 
Fermentables
4 kg United Kingdom - Golden Promise 70.9%
390 g Flaked Oats 6.9%
277 g Brown Sugar - (late addition) 4.9%
200 g United Kingdom - Brown Malt 3.5%
200 g United Kingdom - Chocolate Malt 3.5%
200 g United Kingdom - Roasted Barley 3.5%
130 g United Kingdom - Black Patent Malt 2.3%
130 g United Kingdom - Crystal 45L 2.3%
115 g German - Carafa III 2%
5.64 kg Total      
 
Hops
20 g Chinook 13% 60 min
25 g Hallertau Hersbrucker 3.8% 25 min
30 g Hallertau Hersbrucker 3.8% 10 min
 
Mash Guidelines
15 L Infusion 66 °C 90 min
6 L Batch sparge 85 °C 30 min
Starting Mash Thickness: 2.8 L/kg
 
Other Ingredients
24 g Cacao nibs Flavor Boil 15 min.
40 g Dark cacao powder Flavor Boil 15 min.
35 g Sumatran coffee Flavor Boil 0 min.
35 g Guatemalan coffee Flavor Secondary 60 days
6 g french oak chips Flavor Secondary 60 days
204 ml Kentucky bourbon Flavor Secondary 60 days
 
Yeast
Mangrove Jack - US West Coast Yeast M44
Amount:
1
Attenuation (custom):
70%
Flocculation:
High
Optimum Temp:
15 - 23 °C
Starter:
Yes
Fermentation Temp:
18 °C

clone