I can set the cyclic ring to 20 degrees without mechanical problems when pitch is set to +/- 13 degrees.
I doubt that this makes sense aerodynamically. The motor would probably be overloaded at such a high angle of attack and the airflow on the rotor blade would possibly break off. Should I still set the cyclic ring to the maximum possible value?

It should be set to a maximum possible angle that the manufacturer permits for the model. 20° is way over capability of the most models even if mechanics will allow it. It can cause boom strike with a bigger models.

10 - 12° are fine for the most pilots. Please dont forget that when collective pitch and cyclic pitch are maxed out, it could achieve 30° easily.

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Spirit System developer

The same question arises for the tail rotor blades. The mechanical limits allow angles of attack for the tail rotor blades that are probably much too high. I currently have 35° on the right (against rotor torque) and 19° on the left. The asymmetry is due to stop behavior. Mechanically, +/- 40° and more would be possible, but that seems too much to me. Would you agree?
I suggest that the tuning tips in the manual be supplemented with information on the meaningful limits.