This is not difficult - I did this in training on my second attempt. Familiarise yourself so you can get perfect power at the start of every dive. The ball always seems to appear in the same line as the divers head and spine, so pre-aim here after selecting power to help pre-emp finding the ball. Select the most difficult dives first, eg - 3.4 points, then the 3,2's, etc. You want to average >80points/dive. So for example mine went 87, 83, 79, 76, 75 or thereabouts.