Joseph: I read the discussion. But my Rav told me that people should use the pre-nup, and I defer to him in halachic matters.
As was pointed out, R’ Elyashiv’s teshuva does not say the pre-nup invalidates the get, he just points out that there are those who do say that, so therefore l’chatchilah, you shouldn’t use it. That seems to say that b’dieved, even R’ Elyashiv zt”l held it was ok.
My Rav is a student of HaGaon R’ Hershel Schachter, who is definitely big enough to say the pre-nup is fine.
You say they are incorrect about the mezonos issue. That may be your opinion. But don’t you hold that Daas Torah means you should be mevatel your own Daas to that of the Rav?