3 lbs also seems like a lot to me. What's the size of the batch and what's the rest of the grain bill?
Perhaps you should post the full recipe, including these unusual mash instructions and the community here can assess possibly why it recommends adding so much corn sugar to the mash.
lupus salictarius (60)
Imperial IPA
All Grain (5.50 gal) ABV: 11.58 %
OG: 1.095 SG FG: 1.008 SG
IBUs: 170.6 IBUs Color: 6.0 SRM
By: Fred Bonjour
Ingredients
1.50 oz - Chinook
Mash Hop Addition (8.6 IBUs)
12 lb 4.0 oz - Brewers Malt 2-Row (Briess)
Mash addition (70.8%) - 1.8 SRM
1 lb - Munich 10L (Briess)
Mash addition (5.8%) - 10.0 SRM
12.0 oz - Carapils (Briess)
Mash addition (4.3%) - 1.5 SRM
5.0 oz - Caramel Malt - 40L (Briess)
Mash addition (1.8%) - 40.0 SRM
3.00 oz - Nugget
First Wort Addition (91.3 IBUs)
1.00 oz - Chinook
First Wort Addition (31.5 IBUs)
3 lb - Corn Sugar (Dextrose)
Mash addition (17.3%) - 0.0 SRM
1.00 oz - Simcoe
Boil 45 min (24.6 IBUs)
2.00 oz - Centennial
Boil 5 min (9.2 IBUs)
1.00 oz - Simcoe
Boil 5 min (5.3 IBUs)
2 pkg - SafAle US-56
Fermentis #US-56
3.25 oz - Columbus (Tomahawk)
Dry Hop 3 days
1.75 oz - Centennial
Dry Hop 3 days
1.75 oz - Simcoe
Dry Hop 3 days
Profiles for Recipe
Brew Pot (30 Qt) and Igloo Cooler (10 Gal)
View Equipment Profile
Infusion 148
View Mash Profile
My Aging Profile
View Fermentation profile
My Carbonation Profile
View Carbonation profile
Taste Rating: 35.0
Taste Notes:
Notes:
22.5 b OG 1.005 FG I didn't believe the FG 95% attenuation, Gotta love theis US-56 (US-05)
This is an awesome IIPA hat was modeled after a Pliney the Elder Clone in the 150 clones BYO magazine. Changes were hop substitutions due to availability and my corn sugar bag was 2 pounds heavy ;-) This is a keeper.