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Sweet series here. These birds look more like Clapper Rails to me, BUT I'm not very experienced in differentiating Kings from Clappers because it's not something I ever have to do here in Indiana. Your birds look like a spot on match for the Atlantic race of the Clapper Rail illustrated in the Big Sibley on pg. 152. Notably, the coloration is brownish/grayish overall without much hint of orange, which the King Rails show in my experience. Additionally, there appears to be more white in the tail, which appears to be more consistent with Clapper when comparing it to Sibley. While I feel very comfortable with the majority of eastern US birds, the Clapper vs. King Rail ID is one I have only had to make once, and that was three years ago.
Again, nice set of shots, especially given the conditions!