Modern-Orthodox, by definition is seeking the least, most lenient, way out form of Yiddishkeit.
Then, I wager, you don’t know the definition of “Modern Orthodox.”
A Machmir, on the other hand is a “Charedi” Jew who is not content with the Shulchan Aruch. He always seeks new “Chumros”.
Well, I suppose a machmir, by definition, is always looking for chumros. But what is the value of always looking for chumros?
The Wolf