varying pattern of blinking lights VERY bright, shaped like an inverted question mark

U.F.O. Sighting, no, not “little green men” but something odd last night. It was up in the sky & I can't Identify it, so its a “UFO”, but NOT a “flying saucer” & yes there is another witness.
 I don't know for sure what it was but I assume it was one of Musk's "Starlink" satellite trains? But there are significant differences from other images I've seen of them.
 Last night Western MD (39°38′34″N 77°43′12″W) about 9:30PM a string of 15~20, or so VERY bright white lights in the sky to the South West. (They were so bright they got my attention immediately) Roughly 45° elevation, heading vaguely North. It was a little patchy cloud so they seemed to be blinking on & off, but they were in a crescent shape, not a line like I've seen images of. The whole thing subtended only about 4 or 5°.
 Checking various tables the closest contender would be Starlink 24, or 27, but 5 ° subtention, 45° elevation doesn't match.
Any thoughts or ideas?