I would use both k metabisulfite *and* k sorbate to attenuate rather than just campden (which is actually k meta), and backsweeten. I don't think it matters whether you do it now or later, but I usually find it easier to do backsweetening in the bottling bucket, that way I don't need to worry about liquid volumes.
I would rule out option 1 because, well, 16% is damn well enough ABV, and also you are essentially doing an incremental feeding, and sometimes that can push the yeast to beyond their rated tolerance...you could end up with a real monster before you ended up with unfermentable residual sugar
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Bottled: Basic Spiced Cider, W. Coast of Belgium IPA, NJFB Stout v1 & v2
Mead List: Southern Pyment, Simple Cyser '08, '09,'10 & '11, PomPom Melomel, English hop metheglin, American hop metheglin, Chocolate Mead, Cherry Melomel, Belgeglin, Bochet
Primary: Caramel Quad, Cocobochet
Secondary: Why do I keep this line here...?
Bulk Aging: Mead Day Ginger Metheglin
Planned: Traditional Gesho T'ej
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