A-B, I`ll agree the Transall BR is not a `true` or accurate figure,and if you observed along the axis it would be rather egg-shaped,as most loops are due to the speed and G being different at the bottom and top...unless you have a good power/weight ratio,and minimise speed loss.Also it depends on whether you are displaying,or doing competion,as to how the figure will look to observers.
Sobolev actually rolls inverted after t/o and then pushes up in an inverted climb.Look for the other cockpit videos,ie looking backwards...