If you haven't already, I highly suggest listening to Ulf Wallin's recording of op. 42: they are gorgeously executed and made me fall in love with Reger's solo violin music and put me on my lifelong quest to learn more solo music in general.
For a bit of a self-plug, I have also compiled a big playlist of some of my favorite unaccompanied works, which you can find here: https://open.spotify.com/playlist/6UAAO4Afwr7IMNl8JO20pk?si=g3fZGAqwQBKXUajG_VH7WA
And your Spotify list is certainly something! Lots of pieces there I haven't run into, so now I have more to listen to and learn. -)
The Reger op. 42 are some of my favorite pieces, period, especially the last sonata. I'm not sure when I could give them justice as a performer, though the 2nd sonata seems the least difficult of the bunch. I think I understand them a bit better than the op. 91, in part due to Ulf Wallin's excellent recordings.
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