Dear Alex:
You seem to have done a lot of hard work trying to find settings for repitch and time shift.
The guy who has developed Reaper (momentarily forget his name) may have a forum where you can discuss your reactions in detail. I would suggest you check with the Reaper forum. Since I don’t use Reaper (at least not much) I can’t relate to any of your screenshots, really. I do suggest that any Reaper users here reply to the Reaper items you mention. I doubt that someone who uses a different DAW will have a relevant reaction to your post. Even the most minute difference in a repitch algorithm could invalidate any comparisons to a different DAW.
Hope this helps,
Bob