I flush the carcass out with cold water and the lungs firm up, coming out easierI've found that if I clean the bird except for the lungs, and throw them in my cooler full of ice water until all chicks are processed, and THEN take the lungs out... It's much easier. Maybe they separate a bit from the bone as they chill?
Anecdotal, I know, but it really seemed to make it much easier.