Youngs Super Wine Yeast Compound - This yeast is specially formulated for high alcohol and speedy fermentation and clearing. Use at the rate of 1tsp per gallon
Ingredients: Bentonite, Dried Wine Yeast, Diammonium Phosphate, Trace vitamins, Trace Minerals.
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Now I don't claim to be an expert and am somewhat of a novice myself, but a good rule of thumb that my Gramps used to tell me: is don't push yeast too hard.
I lifted this from a distilling site: " The biggest problem with turbos is people follow the 'instructions' and shoot for 18% or worse yet, 20 or 21%. THAT is what makes for nasty flavored product (well, along with turbo's not settling worth a crap). "
If you want, I can send you the link in a PM to the article that talks about Youngs...as I said it is used heavily for distillation means as well as the turbo yeast...so most information you are going to collect online is in regards to distillation.