SJSinNYC:
Respectfully, I would like to add an additional point of Chumra.
When there is a Machlokes in Poskim, and we Paskin like the Maikel. One who is “Machmir” to be Choshesh for the other side is (in general) praised.
For example, I have heard a story of (I believe) R’ Yaakov who wanted to offer a certain Rav who was with him for Kiddush the right to make Kiddush, but he declined. When pressed, the Rav stated that he had not yet finished Shnaim Mikra, and there is a Shita which hold you are supposed to finish it before eating anything Shabbos day.
A Chumra? Yes. Do we say that anyone who eats before finishing Shnaim Mikra is Over an Issur? I think not.