I think one thing that affected the 830 station was the elimination of the separate OC Arbitron book. As KSRT, the station dates back to before 1990 in fact. And like 1190 and 1480, those stations depended on the "separate market" concept for the county.
As stations changed owners, with many becoming Spanish language, religious or Asian language operations, there was no need for the break-out book.
Even with its 50 kw, 830 does not have a competitive signal north of the 10 Freeway and at night it is even less competitive. And much of the LA County area it covers is highly ethnic, and not likely to listen to the programming currently on the station.
Several technical experts I know believe that the signal is not "like a real 50 kw" station because the transmitter site is at the other side of fault lines, using a belief that radio conductivity over faults is poor. Little research has been done in this area, but the concept is interesting; the belief is that a fault is, in essence, a dielectric.