Kurt,
Thanks for uploading the images and log.
I'm not really sure what is going on, but I have a few ideas.
Please look at
stellarmate.com/support/faq/mounts.html?view=faq&faqid=33
I can see for the first few failed solves the scope was trying to go to DEC=58 (but apparently wound up at DEC=81).
[2023-10-17T20:25:13.611 CEST INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Slewing to RA: 22:48:19 - DEC: 58:15:37 "
but when I blind solve I get DEC=81.28
So, your slews were very inaccurate. You really shouldn't be off by 23 degrees, so you should tighten that up.
Perhaps look at
stellarmate.com/support/faq/mounts.html?view=faq&faqid=33
As you point out, you can successfully solve, e.g. in the polar alignment and in other places.
Of course, in the polar alignment, your slews are not 20+ degrees off from where they should be.
Perhaps that's why they succeeded?
Here are a few other things to try (after trying the above procedure to get your eqmod mount in a known park position):
1) Could you try using a scale unit of arcsec_per_pixel instead of arcminutes width?
Your correct scale, I believe, is 2.1 arcseconds-per-pixel. Start with it set to that.
Of course, the other setting should work, but I'd like to see if there's something wrong with the code there.
The units are set in the align options menu in the "scale and position" tab.
The (silly) "aw" means arcminute width, "dw" means degrees width, and "app" means arcseconds-per-pixel.
2) If the above doesn't work, try solving all your failed images blindly--by unchecking use_scale and use_position in the align options. It would be better/quicker to have these checked, but this should unconstrain the solver, and perhaps allow it to find the solution. If things start working more smoothly you might try to re-check these.
Let us know how that goes,
Hy