Details man. You play the organ, how do YOU do it?
I dont even do those things like I should. I have very bad technique.
When playing piano, your hands should be in a position as if there is a ball under them. Your hands should not be flat on the keys.
On doing runs, you really gotta know your scales and the fingering within the scales. The fingering isnt written in stone, but it sure helps. Sometimes you gotta use your first 3 fingers to execute the run.
You also dont have to BANG the keys. Play them firmly, but dont try to hurt the piano.
Check out how this guy (Fmason83 on lgm) has his hands.