Well, the butter and slickness is caused by the same chemical, and from the same cause, they probably dropped the temp at the wrong time during fermentation, causing loads of diacetyl to be producted. The overpowering sweetness is due to way too much wine conditioner or sugar after they killed off the yeast. The bitterness is a different story, in the strawberry wines I've done, only one has had any bitterness, but it was more like astringency, which was caused by the wild ferment's lag time (at least, that's what I attribute it to) this will go away with alot of aging. I'm sorry you had such a bad experience with strawberry wine, a properly done one is really good and complex, not as much so as like, a old vine zinfindel or something, but still quite good. Go to a hippy community or something and get a swig off of their flask of strawberry wine, and then you know what strawberry wine should taste like.
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Primary:Russian River Redemption clone, Kelly's Melomel, Graham's English Cider 22-23
Clearing:Apple Wine
Aging:Public House Dry Stout, Procrastination Porter, Mr. Brown Ale, Westvleteren 12 Clone, Mead, Duvel Clone, Graham's English Cider 6-21, Belgian Draak Strong Ale, Fig Melomel, Acerglyn, Restorative Tonic Metheglyn
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