The perception is that WISX is more repetitive than a station like B101.1 when in reality, it's the songs themselves; not the frequency with which they're played.
That's the problem with a format that doesn't play any currents. When all of the songs are from a specific era and are of the same tempo, it tends to sound repetitive. That's why other formats mix up tempos or eras. Smooth Jazz found itself in the same rut after a while.