I feel like people use "sharpness" to mean different things that are not always reconcilable. For example, concepts like edge acutance (or "micro contrast" whatever that is), versus resolving power. Like when Paul Howell mentioned with increased grain size and contrast, prints might show increased perceived sharpness, I think he's talking about the perception of sharpitude that comes from looking at an image with well-defined edges - a lot of midcentury journalistic B&W photography looks like this (perhaps Cartier-Bresson, etc). It's not blurry. However, such an image often doesn't resolve the finest details, in the resolving-power sense, so if you do the analog equivalent of pixel-peeping, it may not look "sharp."
Taking your image of the shelf in post #12 as an example: I didn't follow the whole scanning discussion or look for focus offset/motion blur. The grain in the darkish area of wall behind the Ilfostop bottle is fairly visible, I don't know if it's absolutely the sharpest lumpy grain (could be either the development or scanning). If I zoom in on the Ilfostop bottle, the finer text below "Ilfostop" breaks up. The grain isn't so easily visible because it's more of a highlight area than the wall. But it is breaking up in part due to the grains / limitations of the film. Both of these are more or less as expected from fast film that was pushed, ie underexposed and possibly overdeveloped.
I don't think it has to do with the lens, if that is what you were originally trying to test. If you took a similar picture on Tmax 100 (or Delta 100) at box speed and standard development, it would be 4 stops slower and you'd have to use a camera support, but the grain would be much less obvious and fine details would look different. On the other hand, if you took it with HP5+ at box speed in a pedestrian 6x6 camera (say a TLR) with a typical ordinary lens, the perceived grain would also be much less obvious. In both of those, you might be able to read the Ilfostop label. But if you have to do something like available light photography in a nightclub or performance space, neither of those might be sufficient. Resolving power isn't everything.