Thu Aug 23, 2012 10:20 am
High gravity beers can be tough to brew well, especially when first getting started. As Spider said, higher temperatures during fermentation can lead to off-flavors in the finished product, most notably esters (fruitiness) and fusel alcohols (nail polish like aroma, booziness). Unfortunately, most of the times fusel alcohols will not completely fade over time and will contribute greatly to nasty hangover headaches the next day. To control these off-flavors, fermentation must be started at a lower temp (ie 68F) so the yeast don't grow too quickly in a warmer environment. Next time maybe try putting your fermenter in a large tub filled with ice to get that temp too stay cooler for the first 48 hrs or so. California ale yeast is a forgiving yeast that tends to handle temp swings fairly well, but with a 1.098 starting gravity you are already producing a lot of alcohol.
Another thing to consider is not racking the beer to a secondary. Almost all of the beers I brew (even high gravity ones) stay on the original yeast cake in the primary fermenter for 2-4 weeks before packaging directly out of the primary. This allows the yeast to clean up some undesirable byproducts of fermentation and ensures that the yeast finish their job of consuming all the sugars that they can. The only beers I use a secondary for are fruit beers, sour beers, and oak aged brews. Even if the directions for the recipe tell you to rack to a secondary I would not follow that advice. It is not necessary, and can lead to infections from poor cleaning/sanitizing procedures, oxidation of your final product, and simply more work.
Good luck with your next batch and don't let this discourage you. Brewing has a huge learning curve and the best way to make better beer is simply to brew more often!
Cheers -
Brewinhard
"A bad man is a good man's job, while a good man is a bad man's teacher."