thanks for the reply.
The Reason for the question is easy. We are developing an aerodynamic flight model for a semi professional simulator.
The current model does not hold the bank, and you need permanent small inputs in turn direction to avoid an unwanted angle decreasing.
We got informations that below 28 degrees bank, the NG has slightly tendency to roll back to wings level.
Above 28 degrees there should be a slightly tendency to increase the bank and you need small inputs to avoid the increasing.