I prefer to add pellet hops directly into the FV when dry hopping because that maximizes the surface area of hops that come into contact with the beer so you get far more aroma. To stop clogging up your siphon I always cold crash and then put one of these hop spiders
https://www.ebay.co.uk/itm/Stainles...hash=item4d9859be15:m:m-wZ1CTdVPoOOTRyotpg9fg into the FV, you put your siphon into the spider which stops any particles from getting into your siphon. You should use the larger 30cm version. It works brilliantly because there’s so much surface area it doesn’t clog or stop the beer flowing.