yitay: 1) not batel miD’Rabbanan is NOT Batel. Psik Reisha will only take off the Knas for transgressing Ein Mevatlin, not the Gezeira of Berya.
3) OK, that’s a valid opinion. However, I pointed out before that a preponderence of Poskim hold otherwise. Since when is Rav Abadi MACHMIR for a minority opinion?