A change in overall "ranking" with Arbitron by one place is purely relative and not an objective measurement. It's nothing you can bank on when it's within a statistical margin of error. You need longterm trends, and time to let them develop.
But KIRO management also need to address several other issues, each of which are probably contributing to their audience decline, in my opinion. And I suggest they don't wait to consider some of these factors:
Besides the irrelevant-to-Seattle sydicated programming that popped up, and canning the only "liberal" hosts (weekends and late nights) (hey - if you only want the "end of the private roaders" in outside of Puyallup and Arlington to listen, there's other ways to reach them without alienating your core demographics). I also find the spot load sounds a lot more, ahem, loaded on FM now. I don't know if they've added even more minutes for their hourly spot load, but it sure sounds like it, since programming between commercial breaks often sounds to be only a few minutes, while many of the commercials breaks seem to routinely be at least 4 and 5 mintues long.
At least they toned down the canned intros to the newscast. No need to growl as us, sir.
The ultra-brief local newscasts and traffic/weather (they were awfully short before, but blink and you miss 'em now) seem to be geared to what top 40 stations did when they had to run news, and not to the interests or tone of a news-talk audience.
And the audio processing is awfully loud and 'in your face.' Whether a listener cites that or not, I still think it's fatiguing and goes against the grain of what you'd want to provide for a talk audience. Unless you want them to shout. Heavy compression, pumped volume, and mega bass EQ just make it sound desperate and cheap to me. THey may stand out conpared to other signals, but there aren't many people dialing across with an analog needle anymore. Anyone who'd be attracted to a signal that sounds like KIRO-FM does now is probably not interested in news and talk programming, and is likely to be one of those guys with the loud mufflers that I hear every evening gunning it past the stop signs in my neighborhood until dinnertime. "Good Hearted Woman is on, y'all! Yee-HAW!"
KIRO-FM. Just who are your trying to be now? I don't think a lot of your old audience can tell anymore.