To my ear, 1 out of every 4 songs they play is an immediate tune-out. There's no way you can build TSL when you're constantly sending people to the exits.
Again, I'd love to see a Broadcast Architecture style dial test on this format. My hunch is that out of every quarter hour, there's going to be at least one song that's a hard negative, but which song in the set it is will depend upon the slice of demo/favorite stations of the participant. In other words, every time you seg, somebody's going to punch out.
It's no coincidence that good CHR stations get the highest attributions for "best variety" when listeners to various formats are surveyed about their favorite stations(s). That's because they play the biggest hits, monitor their trending, and adjust the playlist often.
The larger the playlist of a format, the harder it is to get high "variety" scores. That's because the tight playlists only spin total consensus hits, while all the others play songs that may have different reactions among different people. Variety is really "lots of songs I like a lot", not "lots of songs".