Russian Imperial Stout Not Bottle-Carbonating: More Sugar or More Yeast?

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Andrew82

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I brewed a Russian Imperial Stout (RIS) earlier this summer (June 17). The recipe is as below:

11 lbs Maris Otter
1 lbs Caramel 120L
11.2 oz Caramel 60L
9 oz Crystal 60L
6 oz Brown Malt
6 oz Chocolate Malt
4 oz Roasted Barley

OG = 1.102
FG = 1.025

Mashed at 152F.

I fermented with two packets of US-05. I let the beer sit in primary for 3.5 weeks. I then packaged 4 gallons in bottles with 80g of priming sugar to achieve ~2.3vols CO2.

3 weeks later, the beer was barely carbonated. Another two weeks? Same condition. Now? Nothing has changed, unfortunately.

I am loathe to abandon this beer. How should I save it?
 
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