We have all been complaining about it!
The shaking of the stick and the buffeting of the A-20.
For those of you with knowledge into the A-20, this characteristic is historic.
This comes from having the upper cowl-flaps open in flight
Source: https://www.youtube.com/watch?v=tM9PP2i3KDk
Go to 5 min in.
The cowlflaps is meant to provide extra cooling during taxi and not used in flight.
Unfortunately this seems to hard to control as it is not intuitive made in the game!
HowTo
Toggle “Switch Common Controls of Engines on/of” ON and use the controls for “Engine Inlet Cowl Shutter Controls”.
If this does not work, use the Toggle “Switch Common Controls of Engines on/of” OFF and ON again
HowTo - Setup “Common Controls”
Settings->Key Mapping->Engine Controls
Go 1/3 down to “Switch Common Controls of Engines on/of”