it doesn't matter if up or down force it's how the plane reacts
in a tailplane stall with a download the nose pitches down usually on approach in ice that is what we train for
in an upload it is simply opposite imagine flying upside down
the airplane flies and usually the factor of length of flight has to do with the engine not the stabilising factors
cessna says and they are right
" it does not matter to the pilot if it is uploaded or downloaded, when you push forwards the nose goes down, when you pull up the nose goes up "

they are right
it is only during stall recovery that it matters

many people think me a wacko but just remember carrie extra speed it does not hurt and if during flap retraction you get a nose up pitch redeploy the flaps

even if you do not believe me doesn't that make sense