It was common to filter to correct critical colour casts in slide film for commercial work. You may be able to do that here. 5 or 10cc's of yellow would combat the blue, I believe. There were wratten filters made in this tyope of strengths for on camera use.

The question here is whether the colour profiles cross one another as they go from light to dark. You cannot filter correct for that, and it does occur in some older poorly stored film stocks.

As to poor Dmax in the film margins, that I would perhaps ascribe to a weak colour developer. Overall image brightness is not bad, so first developer seems to be doing it's job.

The suspect colour developer could to some extent also be the cause for some of the colour shifts.

I am not clear of how this 120 film was processed - commercially, or by a kit with your own efforts.