well it is a trick - but making it work correctly was more than a trick.
The pressure on the stabs change as the rudders deploy. also there being more area high than low - caused a pronounced pitch UP.
the trick was to balance the correct amount of down elevator mix with the throttle shut down curve.
the rudders opened progressively during the last part of the throttle low stick settings.
This is really a cut and try setup as the selection of CG and the resultant elevator trim made it a basket of snakes
I figured it out and so did my friend Rojecki -
you had to fly the things to see how the inter reaction worked.
If it was common -I did not know of it -