Hi Dimitri
Turning onto finals at 220 Kts is a bit high, I normally turn onto finals at about 180 kts, approaching as high as 220 kts can cause you to overshoot the localizer, another reason you may have problems at this speed is that when you turn onto finals, you are more than likely turning into a head wind and if it is a strong head wind your airspeed will increase rapidly, and due to the fact that some of the autothrottles are not quick enough to respond to this rapid increase in airspeed you could experience the problem you suffered. If you purchased the license for FSUICP you would be able to limit the rate of change of the wind under normal flight conditions, however in your case it would not have helped because the increase in airspeed was due to the aircraft changing direction and not the wind changing direction. Hope this helps.