I agree with ML on this, just stick your chiller loss in the Trub Loss. I just up my batch size a little so that I don't have to get the last drop out of my boil pot. That last quart you draw of the boil is where you will get the most trub into your chiller, even if you have a nice trub pile, its that last dash of wort to the outlet that you can avoid. I use a HopRocket filled with polyester to catch the trub, but the cold break protein still tags along with the wort, since the chilling is internal to the plate chiller. The plate chiller is the toughest piece of brewing equipment to master in my opinion.