Sorry to be such a pest, but are they now visible ?
You're not a pest at all, we all just want to help
🙂
I'd like to deal with this image first.
Looking at it it seems to have too much grain in the upper mid tones, especially for the film and developer combination; it is almost certain we are seeing a combination of issues here. I'm going to deal with them one at a time.
The scanning modus.
You scanner is a good one, capable of very good results with medium format as long as you keep it simple and obey a couple of rules.
I've worked out a scanning 101 with Epson scan if you care to read it here:
http://photo-utopia.blogspot.co.uk/2010/11/scanning-with-epson-v500.html
Scanning without sharpening and making sure we don't use auto anything is important, as is scanning in 16bit mode and scanning flat (contrast) as you shouldn't try to get it looking right in the scan import module.
Secondly I still feel exposure is a hair under, If you could please take an iPhone shot of the negative of the shot above I could give better advice.
That said on my monitor at least the hair round the woman's face looks to lack a little detail, grain is showing where it shows most in the mid and upper tones-if you're happy with this level of grain we can pack up and go home now–you're Ok
Look at this shot HP5+ in Rodinal 1:100 the tones are all in the place where grain is going to show most.
Exposure was critical in this shot, I wanted some detail in the eyes but without blowing the highlights.
This shot is on Neopan 400 in Rodinal 1:50 a fast film with so called grainy developer.
In both cases correct exposure makes low grain possible, they were both scanned on the Epson as well.
I'd love to see your negatives still , you're getting there though so take heart.
I think you've probably seen enough of other peoples images to know that what you seek can certainly be found.
Try to stick with your favourite film and developer combo's, keep notes and make sure consistency rules; there is nothing more frustrating than getting it right some of the time.