Ok, just so I'm clear. When you're talking about "roll 3", you mean the third image, I titled "neg3"? Just want to be sure. I know it's a dumb question.
Frame 24 probably looks overexposed because it is a very abstract image. That one actually scanned fine. I did do a minor levels adjustment, though. It is basically of a snow staircase up to a snow slide and partials of people waiting in line as they edge nearer to the start of the line. When I remove the dust from the scan, I can post it if you'd like.
Frame 9 did come out very flat I remember (I adjusted it though). But so did many of the others you're claiming should be fine. I guess, sometimes it is the camera, but usually it's the scanner. But in case I do wet printing in the future, the ones by fault of the camera should be able to be fixed, just like I do on the computer, no?
That's ironic that you say they have lots of contrast, because they don't look like that scanned. I'm surprised they look overdeveloped though. All I did was follow Ilford's PDF on developing your first black and white film. Based on the chart, I needed 9 minutes with DD-X + HP5, so that's what I did. I have found many of the shots have a coarser grain than I'm used to (isn't DD-X supposed to be fine grained?) but from what I've read, I can try doing less agitation to fix that (I was doing 4x every minute as per the PDF).
I might try that with the D90. I was going to use my Yashica A or F90 because I don't seem to have the same issues with them, but I might just opt for the D90 instead.
Thanks for the help!