I glued up some blue construction foam and cut it to a angle that supported the butt and under side of the upper leg past the stick. I did this because the needed soft foam rubber was stacked way too deep to raise me for good over the nose vision,(under the existing soft upholstered cushions), ended up compressing more and more as any flight progressed. At the end of a flight I was often 2 inches or so lower at my destination. The uneven support of the butt and thy would be manifesting as pain after an hour.
Getting the angle right is very important to comfort on extended flights, it is important that slopes upward from the rear to the front at a similar angel to where your upper legs under side is angled while seated at the controls. You do not want all of your weight to be on your tail bone: you want to evenly distribute it between the butt and the underside of the thy.
I plan to re do the ridged blue foam and cover it with a layer of glass and epoxy and paint it to match the interior. If you do this make sure you angle the cut out around the stick so that it does not interfere with the stick!