I made some batches of hopped cider a few years ago using both Galaxy and Citra hop pellets. The "takeaway" from this was that you have to taste, taste, taste every day then take the hops out when the flavour is right as it is taken up very quickly. Roughly 3g/L of hop pellets for 3 - 7 days near the end of fermentation is about right. Hops float and can be a pest unless they are in a weighted bag which you can jiggle periodically.