Drinking zamzam is always recommended. I don’t know any hadeeth in washing the head with it after Tawaf. I also don’t recall being part of the recommended Sunnah to drink it after Tawaf either. If there is an authentic hadeeth, this is sufficient.

Is it sunnah to drink ZamZam and to put some on the head etc, after performing tawaaf and before proceeding to Safah.