I'll bet the 4251 did perform pretty well with 32 and 41. Just out of curiosity, did the Louisville or Cincinnati stations come in better, generally speaking, in Lexington? The distance is roughly the same, but I am wondering if the terrain between Lexington and Cincinnati presented challenges that Louisville didn't. It's all rolling country, not exactly flat, in fact, Frankfort kind of sits down in a bowl and its terrain reminds me more of Madison or Estill counties. WBLG even had to have a translator on channel 58 in Frankfort.
To the east, when you get to the Pottsville escarpment (through Lewis and Rowan counties), you basically lose Lexington altogether, and by the time you get to the Rowan/Carter county line, Lexington is totally gone. The coverage map I got when I visited WKYT around 1972, at the height of their OTA coverage, showed their Grade B contour slicing through Soldier just east of the Carter County line (though with improved technology such as Longley-Rice heat maps, we know that contours don't mean much). I once got WLEX with a loop (or maybe it was a bowtie) on a hillside near West Union, Ohio (Adams County).