OK,
I entered the recipe as you had it listed at the top of the post above.
He did not provide the alpha content of the hops or his boil volume, but just going off the default hop entries in BeerSmith and the 7.7gal boil volume you provided I came up with 69.7 IBUs for Tinseth, vice his listing which has it as 75 IBUs. Also I used your boil/finish volumes.
Keep in mind that a small thing, like taking the Horizon hops to 14% IBU vice 12% would drive it back up to 75 IBUs.
Cheers,
Brad
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Recipe: Imperial Honey Porter
Brewer: Saccharomyces
Asst Brewer:
Style: Robust Porter
TYPE: All Grain
Taste: (35.0)
Recipe Specifications
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Batch Size: 5.30 gal
Boil Size: 7.43 gal
Estimated OG: 1.096 SG
Estimated Color: 28.6 SRM
Estimated IBU: 69.7 IBU
Brewhouse Efficiency: 75.00 %
Boil Time: 90 Minutes
Ingredients:
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Amount Item Type % or IBU
10.00 lb Pale Malt, Maris Otter (3.0 SRM) Grain 55.56 %
4.00 lb Munich Malt (9.0 SRM) Grain 22.22 %
1.00 lb Caramel/Crystal Malt - 60L (60.0 SRM) Grain 5.56 %
0.50 lb Chocolate Malt (350.0 SRM) Grain 2.78 %
0.50 lb Special B Malt (180.0 SRM) Grain 2.78 %
1.00 oz Horizon [12.00 %] (60 min) Hops 34.9 IBU
1.50 oz Cascade [5.50 %] (45 min) Hops 22.0 IBU
0.50 oz Cascade [5.50 %] (20 min) Hops 4.8 IBU
1.00 oz Cascade [5.50 %] (15 min) Hops 7.9 IBU
2.00 lb Honey (1.0 SRM) Sugar 11.11 %