Thank you very much for the quick resolution of this problem, the beta solved it for me!
Attached my customised version of the plot with ‘fixed’ “-15” label.
Here another example that I adapted from above, where the origin is at the top and labels increase clockwise. I see the same issue with the last label, here “23”‘:
Thank you very much for pointing this out, and excuses for not spotting it before. The moving up of angle(x,y) in the reference list and the added documentation relating to atan2 is very helpful too.