What was the Trim Problem on the Brabazon's First Flight?
The one thing I have read about this aircraft years ago, is that it had numerous problems in the flight controls, all of them due to the flight controls cables, whose rigging was unstable. I remember having read that it was a  banana (???) effect to the fuselage.I can’t tell  whether it was distortions in the XY plan on in the XZ plan or something else

Reducing the power would it have modified this banana effect? 
I can’t tell.