I am surprised that lots of people have problems with freely circulating hops. It has never been an issue for me. My hops just get chucked in (whole hops). The boiler has a perforated false bottom and I leave it all to settle for 30 -40 mins at the end of the boil. It is then run off into the fermenter under gravity via a plate chiller. I have never had problems with clogging and the hops form a really good filter bed on top of the false bottom which catches pretty much all the trub. I do end up leaving a little wort in the boiler at the end but only 300ml or so.