Hello99,
YD 53:4 : Yes you need a tlia, but it’s otherwise assur meiikar hadin. The term “?? ?????? ??????” is obviously only used where there is another approach, but still represents the basic din according to the one using it.
48:12: See Shach, who explains it’s a gilui milsa because there’s already raglayim l’davar. Sounds meikar hadin to me.
To me, a “chumra” means it’s optional. I don’t think one has a right to be meikel in these cases without additional cause.