look in chazon ish Y”D siman 41
I’m familiar with it; I always wondered about the application halacha l’meisa, since the accepted practice was always like the Chasam Sofer to be machmir.
This makes sense now; the Chazon Ish personally held like the Pri Chodosh, (as written in the sefer) but because of the commonly accepted practice, would only rely on his opinion b’sha’as had’chak (with the tziruf of avkas cholov).