I believe the yeast did exactly what it was bred to do. As most English strains, S-04 does not process maltotriose so it leaves undigestible sugars therefore leaves the gravity ‘high’. You have to plan for high FG when using this yeast.
I believe repitching the same yeast will not produce any difference in FG. If a yeast that can digest maltotriose was re pitched I believe a change in FG will be seen.
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