I agree with what has been posted - I only dry hop with fine-mesh nylon bags that can be sterilized and re-used. The fine-mesh is important and these are not cheese cloth which can expand and have bigger holes. Allows the flavors through, but not the hops. I do get some floaties on initial pours, but I also get a little yeast trub, too - it's all part of the process
I never have gone back to whole leaf and usually dry hop with 3-6+ oz. of pellets - kegs usually never last more than 2 months max, never an issue leaving them in the whole time. Never have sunk or weighted the bags either, even though I know that they float - I just transfer through the bag into the keg and leave it floating in there. Probably a little better usage to have them sunk to the draw tube, but if I felt like it needed that, I would have done that. Just for reference, I live in San Diego and am a huge hop head! Local brews that I strive to be close in taste/hoppiness for my IPAs: Societe Pupil, Alpine Nelson, Stone Enjoy By - FYI these are hop bombs if you have not had the chance to try. Cheers!