So.... I tried making some cider. I mixed 4 gallons with yeast... fermented it... added camden tablets and potassium sorbate. Stuck it into a keg under pressure... I'm not sure what happened. It seems to sweet and not fermented enough yet.... the question is... is this fixable? Can I take the pressure off and repitch some new yeast?... or will the potassium sorbate stop it? Any way to fix this?