Thank you for your previous reply.
I have manually reduced gyro gains on my Royal SRS by 5%. I flew once again my airplane and was again very sensitive, especially on elevator. I can say that problem increased instead of decreased.
After the flight I have checked "airspeed menu" on my Royal SRS. The reading was 403km/h.
There is no way to reach this speed with scale Hawk100.
For your information, I never update my GPS II.
I would like to remind you that the problem started just after the updade of Royal SRS.
Any recommendations for the solution of the problem?