I also was having problems with PPA and in general, plate solving.
I think I had a similar issue, that once you have an incorrect telescope alignment or reported position incorrect, the solver
has a search radius of 15 degrees. I tried to change the search radius and it didn't seem to change anything. There might be
a bug on this setting?
Perhaps autofallback to blind solving would help? Clearer indication of what to change in the UI for blind solves?
... when it was working, it was so so fast though!