I just punched it quick and dirty into Beersmith. I assumed a 3gal, 60min boil.
Style: Imperial IPA
TYPE: Extract
Recipe Specifications
--------------------------
Batch Size: 5.00 gal
Boil Size: 3.00 gal
Style: Imperial IPA
TYPE: Extract
Taste: (35.0)
Recipe Specifications
--------------------------
Batch Size: 5.00 gal
Boil Size: 3.00 gal
Estimated Original Gravity: 1.088 SG (1.075-1.095 SG)
Estimated Final Gravity: 1.019 SG (1.012-1.020 SG)
Estimated Color: 11.6 SRM (8.0-15.0 SRM) Color [Color]
Bitterness: 43.0 IBU (60.0-110.0 IBU)
Alpha Acid Units: 33.0 AAU
Estimated Alcohol by Volume: 9.04 % (7.50-10.00 %)
Ingredients:
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Amount Item Type % or IBU
10 lbs Light Dry Extract (8.0 SRM) Dry Extract 90.91 %
1 lbs Caramel/Crystal Malt - 20L (20.0 SRM) Grain 9.09 %
0.50 oz Cascade [5.50 %] (Dry Hop 7 days) Hops -
1.50 oz Magnum [14.00 %] (60 min) Hops 30.1 IBU
1.50 oz Ahtanum [6.00 %] (30 min) Hops 9.9 IBU
0.50 oz Ahtanum [6.00 %] (15 min) Hops 2.1 IBU
0.50 oz Cascade [5.50 %] (5 min) Hops 0.8 IBU
1 Pkgs California Ale (White Labs #WLP001) Yeast-Ale
As you can see, your biterness should be much higher for an IIPA. Otherwise, it might be pretty dang sweet as it sits now. Maybe some more Magnum, or whatever else you have available early in the boil. As far as yeast, I'd make a starter with just one vial. 1.088 is not that high. Check out this page:
http://www.howtobrew.com/section1/chapter6-5.html
It says 1/2 quart water to 1/2 cup DME. I like to make bigger starters a few days before hand, so I'd do at least double that. If your brewing on a Saturday, I'd make the yeast starter up on a Thursday. Also, I would just make sure you aerate a ton before pitching. If you shake to aerate, shake till your arms almost fall off. Be sure to add some yeast nutrient, pitch, and let it go. I don't do anything to mine as it ferments, and I've done some beers up in the 1.090's. Just make sure you have a blowoff tube because big beer and yeast starters make for some hard fermentations!!
