It was interesting reading about all the storage issues you had and thus going to a clean install. FYI, I store my LR Classic catalog and files on an external drive, so I can use multiple computers (I have kids) for LR Classic. And with so many TPF users talking about Curves I spent some time learning them, so I use it quite frequently now. Seeing that it is lacking in CC is disturbing. But at this point I don't do this as a profession and don't see a need to upgrade unless I buy a new camera that is not in the profile (and then there are other options).
Unfortunately, as one gets older many loose their eye sights contrast ability. I've found this true for myself. Using light grey on white can make it harder for some of the older population, such as myself to read, so I have to highlight sections as I read. But I do clearly see certain phrases in regular black on white background. FYI, I do have my Windows set up to show the best contrast and larger text.