KCAL-FM has always leaned harder-edged in its playlist. According to Wikipedia, the rock format goes back to 1969! I just checked the "Recently Played" list. Nine Inch Nails, Nirvana, Guns n Roses, Rage Against The Machine and Linkin Park. That's clearly an Active Rock playlist.
Sometimes softening a station will bring additional women. But in the case of Rock stations, that is not really true. Most women aren't that interested in rock formats. And guys who want rock may think their station has become too pop for their tastes.
BTW, the KCAL stations are similar to the WBZ stations. Three stations with the same call letters but all with different owners. KCAL-FM is owned by Anaheim Broadcasters (which also owns Classic Hits KOLA). KCAL (AM) is owned by Lazar Broadcasting (which specializes in Latino formats). And KCAL-TV is owned by CBS, as a duopoly with KCBS-TV.