I lay my hopped corny kegs on their side in a X type rack I built. This allows the trub to settle on the side of the keg which is now the bottm. I rotated the keg down (Out Tube) tube so it is just below the surface of the beer inside. As the beer is drafted off I continue to rotated the kep to keep the tube just under the beer surface. You can then rotate (very slowly) the tube up over the beer surface and eject what ever beer is still in the tube by running a mini brew sample off. I read about this technique for using a corny to cask condition. Some time back I thought about assembling a hose with a float in one end that would fit onto the end of the down tube. Then carving or drilling a couple holes through the hose just under the float would allow beer entry. This may remove most of the need to rotate the keg. Just ideas!