Do I get a do-over?
But also keep in mind that the MINIMUM Halacha IS the Halacha.
That’s not untrue, but it’s oversimplified. There are cases, for example, where something is muttar b’sh’as had’chak. Off the top of my head, I’ll use an example of davening before sunrise. For someone who needs to travel, it’s allowed. Why? Because it’s at or above the minimum. However, it’s forbidden to do so to play golf. Why? If it’s the halachah, it’s the rotzon Hashem! The answer, of course, is that it’s only permitted to follow the minimum in a sha’as had’chak. I feel the same way, based on my research (this is all NOT merely off the top of my head) about Shabbos make-up.
And, I don’t know that any make-up was ever manufactured according to R’ Moshe’s psak; I’m even more doubtful today.