when air is moving faster than the other air around it the faster moving air creates an area of low pressure which means the slower moving air is at a higher pressure. so if you have fast moving air flowing over top of an object and slow moving air flowing underneath the object the higher pressure from the slow moving air will push the object up because of the lower pressure created by the fast moving air on top.
there was multiple things that made the different rockets better than others some of the main things that positively affected the height and distance of the rocket was: a pointy tip, a 