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Turns out it was a bad scan, I've been having this issue and never realized the cause. The issue is the film curl, not laying flat. I purchased a piece of glass to weigh down the negative (from betterscanning.com but much too expensive) but, alas, it makes a huge difference. Re-scanned below. Still lots of grain, which I like, but a big difference. (Forgive the dust!).
This was Rodinal 1:50 for 20min at 20deg C.
I use an Epson V500 to scan. It's inexpensive (~$175) but I can't really recommend it. You can do two strips of 6 at a time, which is nice, but the plastic holder is very flimsy and cheap. A nice replacement for 120 film is $80+, and the glass for 35mm is expensive also. . It is the least favorite part of my workflow, and one of the most important!
Well, Rodinal has great acutance and was my favorite devleoper. Since it doesn't have sodium sulfite like D-76 and similar developers, grain is not softened.
I recently upgraded from a V500, which is a fine scanner, to a V700. It made a noticeable difference. I had a much older Epson that could scan 4x5 (2475?), but it isn't supported on new operating systems and doesn't have great specs. I moved to the V700 to get back the ability to scan 4x5. It will even scan in some vintage 5x7 glass plates I inherited. I'm really looking forward to scanning them!
I haven't scanned much 35mm, but I did some scanning of 4x5 negatives for a project for my adult son last weekend. The negatives were on Agfapan 400 developed in Rodinal. We did 13x19 prints on a Canon Pixma Pro 9500 using its ability to print true B&W. I post processed using NIK's Silver Efex Pro. The resultant prints are as good as anything I got out of my wet lab using a Beseler 45MCRX with a Nikkor and Schneider 150mm lens. I just love the fact that I can dodge and burn to my satisfaction, then all resultant prints are exactly the same.