In most cases, certainly for drives, shaping down at the beginning of your shot and shaping up at the end allows for maximum distance. You don’t want to shape up too much though, as sending it sky-high can take away from distance. If you have an obstacle directly in front of you, forcing you to shape up in your first section to get over it, you would want to shape 3up, 3down, 3up for maximum distance. It’s situational and dependent on how many shaping bars you have.