as requested
Your negatives appear to show zones of stronger development towards the top. There are also faint 'shadows' of the sprocket holes in those areas. You might want to inspect the negatives closely to see if it's just a digital artifact, or an actual defect in the negatives.
Edit: I just rechecked the light table 'scan'. I'm virtually certain you've got the exact kind of problem that stand development brings the risk of. See here a curve-adjusted version of the cat-in-the-box (ain't it cute when they do that

Note the 'bag-like' zone of higher density in the center of the frame. This might be (part) natural lighting, except for the darker spots immediately underneath the top row of sprocket holes; it's the clearest in the full frame shown and then the 2nd sprocket hole from the right. Once you notice it, it also becomes fairly easily visible in other places. It may not look like much of a problem in most images, but try and shoot an open sky or any other larger surface of even tone or a mild gradient. There will be problems if you print or process such images.
When testing with stand development and reduced agitation schemes, be sure to include a couple of shots of scenes with large swathes of even tone, preferably along the edges of the film as this is where problems tend to show up the most. Such scenes should render with perfect evenness.
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