I don't think the fusel taste is as bad as you think it is. And some fusel alcohol is acceptable in Sassion, Grand Cru, and Biere de Garde styles.
I pitched my Grand Cru at 85F. My room temp was about 75F. It stayed above 80 for the first 24 hours. Since pitching, my room temp is staying about 75F, +/- 2F.
After when I racked it after two weeks in the primary, it had some fusel taste. I pulled a sample from it over the weekend, after it had been in the secondary for about a week. The fusel taste is all but gone.
Planning: Agave Witbock, Raisin Beer
Primary: GF Hazelnut Stout
Tertiary: Cranberry-Pom pLambic (est. bottle date: 03/01/08)
Drinking: Cab.Sav/Merlot Wine, Grand Cru, Hazelnut Stout #3, Ordinary Bitter