I use a Birko Urn with exposed element, a hopsock, and never whirlpool. I just let it sit with the lid on for 20 minutes, pour off a glass of murky wort then the rest flows crystal clear. If there is a bit of excess wort (I no chill and occasionally get a litre extra over and above the 23L for the cube) then I run that off first into a Schott Bottle and cool it down overnight then drain the clear stuff off to use in yeast starter. It occurs to me that tilting the urn back a tad by 'chocking up' the front of the urn where the tap is might give clear runnings from the beginning, might try that next brew.