sensor dust on new d300

To my horror, I discovered three faint dust spots, each which would be about 1/2 inches on a 9.5x14 print, on my D300 which is barely three weeks old and has been shod with the same 18-200 vr almost all the time. I've done the mirror-lockup thing, blasted the sensor with a Giotto Rocket and have done the dust-off routine on startup all the time, yet the dust spots still are there.
Oddly, the Giotto routine works wonders on my D200 and any dust spots to show up there are more pronounced yet much smaller than on the D300. Short of shipping the D300 off to Nikon, any suggestions? I might just have to deal with the dust spots with the clone tool in Photoshop.

 

Re: Sensor dust on 300

To my untrained eye, the sensor looks clean -- that is, spotless. After my original post, I launched a third attack on the sensor with the Giotto Rocket, blasted the hell out of it again. The spots still are there, but even less pronounced than they were at the earlier writing. At this point, I don't think it's worth it letting the Nikon folks have my beloved D300 for the two to three weeks of shop time. I should be able to find an effective band aid in PS or NX2.