I somewhat disagree with your programming choices. If I were a PD (I'm not even though my screen name suggests it. I'm just a radio fan who enjoys discussing music and radio

), I would definately add newer songs earlier, even if a competitive CHR is not playing some of this music. This is the reason newer songs tend to get "trapped" within the 20 to 30 portion of the Hot AC chart. Because too many stations are waiting for similar minded stations to add certain songs before they do, and these songs ultimately end up flopping, even with good callout numbers.
The Mix in Chicago recently has become more aggressive in adding newer music, particularly pop crossover music. And guess what, their ratings spiked up this past book, even as their main CHR competitor's ratings spiked up as well. I think the core Hot AC demographic is more "hip" to new music than you may realize.
I'm not trying to come across sounding like I'm an expert in radio, but these observations are just my opinions. Now of course I have never programmed or worked at a radio station, so you probably know a lot more about the radio business than I do Double_R. ;D