Tolkien didn't talk about legions of Balrogs after writing the LotR. What he wrote before that doesn't really matter.
No, they weren't 30 foot tall. And no, they didn't have wings.
The Boldogs that have been mentioned here aren't really "lesser Balrogs". Tolkien wrote that "Boldog" was a common name for powerful Orc-chieftains. He then speculated that they might not have been real Orcs at all, but lesser Maiar.
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