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There was probably enough yeast present in the bottle to reabsorb the diacetyl, which is good for you. Diacetyl in the finished beer is a relatively easy thing to avoid... post-fermentation rest...

Dry hopping won't add bitterness; boiling is required to convert alpha acids to iso-alpha acids, which are the bittering components.

Galaxy is a really good choice... I think you would like Simcoe...