Agreed on the 60m boil. Citra should be a good hop to go with strawberries, but keep a light hand. I wouldn't do any more than what you have there. I haven't used strawberries myself, though I've had a number of beers with them (Brewdog had a barrel IPA with strawberries that was very odd but good). I don't know how many strawberries would be best to use, but make sure whatever you do use is very ripe. That will minimize the acid you get from them and promote the flavor.
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