Will Hill, when I spoke to Rav Dovid Feinstein after reading the Igros Moshe inside, he implied that he IS fitting into the teshuva of his father. Other talmidim of Reb Moshe ZT”L clearly argue. Rabbi Frankel of the Agudah of 5 towns agrees with me, as posted here earlier from another website. The MTJ payphone#, for those who don’t have it, is (212) 962-9296. I don’t know Rabbi Frankel’s number, the one who wrote the Yad Dodi, but I’m sure it’s in the phone book.
The recommendation in my yeshiva was that one should keep cholov yisroel when he got married. I tried to follow it, but my milk sensitivity meant that I just couldn’t stomach the stuff- it was almost always spoiled, or about to be spoiled, and chamira sakanta meissura. My guf precluded me from being a baal nefesh. Clearly, those who want to be machmir have a solid basis for doing so. And based on Reb Dovid’s interpretation of his father’s Teshuva (Reb Dovid being on the Moetzes and all), those who want to be meikel, yesh al mi lismoch. As always, ask your rav and poseik- I’m a balabos, and real poskim don’t hang out on the Internet anyway.