Two of the other in-town C1's have tower height advantages: 92.9 (64KW at 1115 feet) and the Bull (78KW at 1083 feet) verses WSBB FM's 915 feet. Neither is directional like 95.5. IIRC the northwest notch for 95.5 is due to WSM FM 95.5 Nashville's (a full class C) protection:
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Still 95.5's signal is a lot better than 100.5 which is a class C2 which is very similar to the class B's (except for the 60 db protection) that a lot of markets are limited too. 100.5 get clobbered north of Canton quite frequently by on channel WSSL (100.5 100KW@1250 ft. Gray Court (Greenville SC).