The other thing is the couple stubborn spots (two of which I have to pixel peep to see) don't show up when I shoot against a white wall with the flash like I did at work. So they may have been there before I even started all this testing. Most of the spots left with blowing. I think I will do a few more series of high speed continuous shots tomorrow and see what happens from that. If I don't get anymore stubborn spots I think I will call it there.